# Time Calculator Cardamon — full reference

> Free time-duration calculator. Add, subtract, multiply, and divide durations across years, months, weeks, days, hours, minutes, seconds, and milliseconds. Type a natural expression like "5h 30m + 2h 15m" and read the answer. The same engine runs on web, Android, and iOS.

Home: https://www.timecalculator.app/
Maker: Cardamon (support@cardamon.org)
Rating: 4.6/5 from 391 Google Play ratings
Pricing: web is free (ad-supported); Android is free with no ads; iOS unlocks the full app with a Pro purchase

## About the author
Dmitrii Kargashin is the solo founder of Cardamon Inc and the developer behind Time Calculator. He builds and ships his products end to end, from the first idea to deployment, and he wrote the calculation engine that runs the same way here on the web as it does in the Android and iOS apps. Before going solo he led engineering teams and built large-scale enterprise systems used by thousands of people. He works across the stack in TypeScript, Node, Vue 3, and PostgreSQL.
He also builds JSON Copilot (https://www.jsoncopilot.com) — an LLM-assisted JSON tool that explains, transforms, and validates JSON for people who do not write code; and noHuman Team (https://www.nohuman.team) — a platform that turns AI agents into collaborative startup teams with real roles and tools.
LinkedIn: https://www.linkedin.com/in/dmitriy-kargashin | GitHub: https://github.com/dmitriykargashin | Author page: https://www.timecalculator.app/dmitrii-kargashin

## How it works
Write durations on one line and join them with operators: + adds, - subtracts, × (or *) multiplies by a number, ÷ (or /) divides by a number. Each duration is a number and a unit, like 2h or 45 min. Every number needs a unit; a bare number is only valid as the ×/÷ multiplier. Choose how the result reads with the format picker, e.g. "Hour Minute" gives "7 Hours 45 Minutes".

## Unit conversions
1 day = 24 hours = 1,440 minutes = 86,400 seconds. 1 week = 7 days. 1 hour = 60 minutes = 3,600 seconds. 1 minute = 60 seconds = 60,000 milliseconds. 1 second = 1,000 milliseconds.

## Time unit converter (https://www.timecalculator.app/convert)
### How many hours is 90 minutes?
90 minutes is 1.5 hours, because one hour is 60 minutes and 90 divided by 60 is 1.5. Choose the Hour format to read any duration as decimal hours. In the calculator, `90 min` returns 1.5 Hours.

### How many minutes is 2 hours?
2 hours is 120 minutes, because each hour holds 60 minutes and 2 times 60 is 120. The Minute format returns the total as a single minute count. In the calculator, `2h` returns 120 Minutes.

### How many minutes is 300 seconds?
300 seconds is 5 minutes, because a minute is 60 seconds and 300 divided by 60 is 5. Pick the Minute format to convert any number of seconds into minutes. In the calculator, `300 sec` returns 5 Minutes.

### How many seconds is 5 minutes?
5 minutes is 300 seconds, because one minute is 60 seconds and 5 times 60 is 300. The Second format gives the total in whole seconds. In the calculator, `5 min` returns 300 Seconds.

### How many hours is 3 days?
3 days is 72 hours, because a day is 24 hours and 3 times 24 is 72. Use the Hour format to turn any number of days into total hours. In the calculator, `3 days` returns 72 Hours.

### How many days is 60 hours?
60 hours is 2 days and 12 hours, because a day is 24 hours, 60 divided by 24 is 2 with 12 left over. The Day Hour format splits it into whole days plus the remaining hours. In the calculator, `60h` returns 2 Days 12 Hours.

### How many days is 2 weeks?
2 weeks is 14 days, because one week is 7 days and 2 times 7 is 14. Pick the Day format to convert any number of weeks into days. In the calculator, `2w` returns 14 Days.

### How many seconds is 2500 milliseconds?
2500 milliseconds is 2.5 seconds, because a second is 1000 milliseconds and 2500 divided by 1000 is 2.5. The Second format reads milliseconds as seconds. In the calculator, `2500 ms` returns 2.5 Seconds.

### How many milliseconds is 3 seconds?
3 seconds is 3000 milliseconds, because one second is 1000 milliseconds and 3 times 1000 is 3000. The MSecond format returns the total in milliseconds. In the calculator, `3 sec` returns 3000 MSeconds.

### How many hours is 7200 seconds?
7200 seconds is 2 hours, because one hour is 3600 seconds and 7200 divided by 3600 is 2. To convert seconds to hours, divide the second count by 3600. Choose the Hour format to read any duration in seconds as decimal hours. In the calculator, `7200 seconds` returns 2 Hours.

### How many seconds is 2 hours?
2 hours is 7200 seconds, because each hour holds 3600 seconds and 2 times 3600 is 7200. To convert hours to seconds, multiply the hours by 3600. The Second format returns any duration as a single second count, so 1.5 hours reads as 5400 Seconds. In the calculator, `2h` returns 7200 Seconds.

### How many weeks is 14 days?
14 days is 2 weeks, because one week is 7 days and 14 divided by 7 is 2. To convert days to weeks, divide the day count by 7. Pick the Week format to read any number of days as weeks, so 21 days returns 3 Weeks. In the calculator, `14 days` returns 2 Weeks.

### How many days is 2 years?
2 years is 730 days, because the calculator counts each year as 365 days and 2 times 365 is 730. To convert years to days, multiply the years by 365. Choose the Day format to turn any year count into days, so 5 years returns 1825 Days. In the calculator, `2 years` returns 730 Days.

### How many years is 730 days?
730 days is 2 years, because the calculator counts each year as 365 days and 730 divided by 365 is 2. To convert days to years, divide the day count by 365. Pick the Year format to read any number of days as decimal years. In the calculator, `730 days` returns 2 Years.

## Frequently asked questions
### How do I add hours and minutes together?
Put a + between the durations, like "5h 30m + 2h 15m", and you get 7 Hours 45 Minutes. Mix any units you like (days, hours, minutes, seconds) and choose how the answer reads with the format picker.

### How do I subtract time?
Use a minus sign. "8h - 90m" gives 6 Hours 30 Minutes, and "2 days - 4h" gives 1 Day 20 Hours. It subtracts across units, so you never have to convert everything to minutes first.

### Can I multiply or divide a duration?
Yes. Pair a number with × (or *) and ÷ (or /). "8h 15m × 3" gives 24 Hours 45 Minutes, and "1 day ÷ 4" gives 6 Hours. Handy for shifts, billing, or splitting time evenly.

### What units does the time calculator support?
Years, months, weeks, days, hours, minutes, seconds, and milliseconds. Type the full word or the shorthand (h, m, d, w, s), like "1w 3d", "90 min", or "1d 4h 30m". Months take "mo" so they don't clash with minutes.

### Is the time calculator free?
The web version is free to use and is supported by ads. The Android app is free with no ads, with an optional donation if you want to support it. On iOS, a Pro upgrade unlocks the full app. Whichever you use, the calculation runs entirely on your device.

### Does the website give the same results as the app?
Yes. The site runs the very same engine as the Cardamon apps, compiled for your browser, so the answer you get here matches the app down to the millisecond.

### Why doesn't typing "2 + 2" work?
Every number needs a unit. "2 + 2" is ambiguous, but "2h + 2h" gives 4 Hours and "2d + 2h" gives 2 Days 2 Hours. The only bare number allowed is the multiplier or divisor, like the 3 in "8h 15m × 3". Always attach a unit to each value.

### How do I change the format of the result?
Open the format picker and pick how the answer reads. Options include Hour Minute, Hour Minute Second, Day Hour Minute, Minute, Second, and Week Day. The same total stays fixed; only the wording changes, so "450 minutes" can show as 7 Hours 30 Minutes or 450 Minutes.

### How do I get a minutes and seconds (min:sec) result?
Type your calculation, then choose the Minute Second format from the picker. "3m 45s + 90s" becomes 5 Minutes 15 Seconds. You can also pick plain Second to read it as 315 Seconds, or Hour Minute Second for longer durations. The format only changes how the answer is displayed.

### Does it work offline and in the browser?
Yes. The web version runs entirely in your browser using the compiled calculation engine, so it keeps working with no connection once the page has loaded. The calculation never leaves your device. The Android and iOS apps run fully offline too.

### Are there any ads?
It depends on the platform. The Android app is free and has no ads. The web version is free to use and is supported by ads. On iOS, you unlock the full version with a Pro purchase instead of ads. In every case the calculation runs on your device.

### Can results be negative?
Yes. When you subtract a larger duration from a smaller one, the result goes negative. "30m - 2h" gives -1 Hour 30 Minutes. This is useful for tracking deficits, like time over or under a budgeted total, without forcing you to reorder the durations yourself.

### Does it handle milliseconds?
Yes. Milliseconds are a supported unit, written as "ms". You can add, subtract, multiply, or divide them like any other unit, for example "1s - 250ms" gives 750 Milliseconds. It is one of the few time calculators that goes down to the millisecond, which audio and dev users rely on.

### How do I get a decimal hours result like 8.25?
Type your durations, then choose the single Hour format from the picker. "8h 15m" reads as 8.25 Hours, and "90 min" reads as 1.5 Hours. Values that don't divide evenly show seven digits, so "1h 20m" becomes 1.3333333 Hours. Great for payroll and timesheets.

### How do I find the time between two times?
Enter each clock time as a duration from midnight, then subtract. For 9:15 to 17:45, type "17h 45m - 9h 15m" to get 8 Hours 30 Minutes. For an overnight span, add 24h to the end time. This is pure duration math, so it never uses dates, the clock, or now.

### How do I add up video or audio lengths?
Add the clip lengths with + signs, like "22m 30s + 45s + 1m 15s", then pick Minute Second to read 24 Minutes 30 Seconds. Seconds and milliseconds are both supported, so "3m 12s 500ms + 47s" works too. Handy for stacking podcast segments, tracks, or render times.

## Guides
### How do I add up hours and minutes?
Type each duration with its unit, join them with a plus sign, and the calculator returns one clean total. For example, enter "8h 15m + 7h 45m" on a single line. Pick a result format like "Hour Minute," and it carries every 60 minutes into an hour for you automatically.

Adding hours and minutes by hand means tracking two columns and carrying every 60 minutes into the next hour. It is the kind of arithmetic that is easy to fumble at the end of a long week. This calculator handles the carrying for you. You write the durations the way you would say them, and it returns one total in whatever format you choose.

Steps:
1. Write each duration with its unit — Every number needs a unit. Type hours as h and minutes as m, so a shift becomes 8h 15m. You can write 8h, 45m, or 8h 15m, but never a bare 8.25. The unit is what tells the calculator whether you mean hours or minutes.
2. Join the durations with a plus sign — Put a + between each entry and keep everything on one line: 8h 15m + 7h 45m + 8h 30m. Add as many shifts as you need. To take time off, use a minus sign, like 9h 30m - 45m for an unpaid lunch break.
3. Pick a result format — Choose how the total reads from the format picker. Hour Minute gives you something like 40 Hours 25 Minutes for payroll. Day Hour Minute is handy when a total runs past 24 hours, and Minute gives a single number when you need to multiply by a rate.
4. Read the carried total — The calculator rolls every 60 minutes into an hour, so you never see a result like 39 Hours 85 Minutes. The same expression can be shown in several formats, so switch the picker to view the same total as hours, days, or plain minutes.

Worked examples:
- `8h 15m + 7h 45m + 8h 30m + 6h 50m + 9h 5m` = 40 Hours 25 Minutes  (Five daily shifts added into one weekly timesheet total.)
- `8h 15m + 7h 45m + 8h 30m + 6h 50m + 9h 5m` = 1 Day 16 Hours 25 Minutes  (The same week shown as days, hours, and minutes when the total tops 24 hours.)
- `9h 30m - 45m` = 8 Hours 45 Minutes  (Subtract an unpaid lunch break from a single shift.)
- `8h 15m × 5` = 41 Hours 15 Minutes  (Multiply one identical shift by five days instead of typing it five times.)

Questions:
- Do I have to convert minutes into decimals first? — No. Type the minutes as minutes, like 45m, and leave them alone. The calculator does the carrying, so 8h 15m + 7h 45m comes out as a clean hours-and-minutes total. You never have to turn 45 minutes into 0.75 by hand.
- What if my total goes over 24 hours? — It still works. A full week of shifts can easily pass 40 hours, and the calculator shows it correctly in Hour Minute. Switch the format to Day Hour Minute if you would rather see it broken into days, hours, and minutes.
- Can I subtract a break from the total? — Yes. Use a minus sign for any time you need to remove, such as 9h 30m - 45m to drop a 45 minute lunch. You can mix plus and minus signs in the same line to add shifts and subtract breaks together.

Full guide: https://www.timecalculator.app/guides/add-hours-and-minutes

### How do you calculate hours worked between two times?
Write each clock time as hours and minutes counted from midnight, then subtract the start from the end. So 9:15 becomes 9h 15m, 17:45 becomes 17h 45m, and typing 17h 45m - 9h 15m gives 8 Hours 30 Minutes. The calculator does the borrow. It works for same-day shifts; for an overnight, add 24h to the end.

The trick is to treat each clock time as a duration counted from midnight. Quarter past nine in the morning is 9h 15m into the day; quarter to six in the evening is 17h 45m. Subtract one from the other and you have the shift length, with the awkward minute borrow handled for you. This holds as long as both times fall on the same day.

Steps:
1. Write each clock time as hours and minutes — Count from midnight on a 24-hour clock. 9:15 in the morning is 9h 15m. 5:45 in the evening is 17:45, which is 17h 45m. Afternoon and evening times pass 12, so 2 p.m. is 14h, not 2h.
2. Subtract the start from the end — Put the later time first and subtract the earlier one: 17h 45m - 9h 15m. The calculator borrows across the hour for you, so you skip the carry-the-minutes step. The answer is the shift length.
3. For an overnight shift, add 24h — When the clock-out is the next morning, add a day to it. A 22:00 to 06:00 shift is 6h + 24h - 22h, which comes to 8 Hours. The +24h carries the end time past midnight so the subtraction stays positive.
4. Subtract breaks and pick a format — Take off an unpaid lunch with another minus, like 17h 45m - 9h 15m - 30m. Choose Hour Minute for payroll, or chain whole shifts with + to total a day or a week.

Worked examples:
- `17h 45m - 9h 15m` = 8 Hours 30 Minutes  (A 9:15 to 17:45 shift, by subtracting the two clock times written as durations from midnight.)
- `17h 45m - 9h 15m - 30m` = 8 Hours  (The same shift with a 30-minute unpaid lunch removed.)
- `6h + 24h - 22h` = 8 Hours  (An overnight 22:00 to 06:00 shift: add 24h to the 6 a.m. clock-out.)
- `8h 30m + 7h 45m` = 16 Hours 15 Minutes  (Add two finished shift lengths into a running total.)

Questions:
- Can I just type the clock times like 9:15 and 17:45? — Not with a colon, but you get the same answer a different way. Write each time as hours and minutes from midnight (9:15 is 9h 15m, 17:45 is 17h 45m) and subtract: 17h 45m - 9h 15m gives 8 Hours 30 Minutes. This works for any two times in the same day.
- How do I handle a shift that crosses midnight? — Add 24h to the clock-out time, since it falls the next day. A 22:00 to 06:00 shift is 6h + 24h - 22h, which is 8 Hours. Without the +24h the subtraction would go negative, because 6 is less than 22.
- How do I subtract a lunch break? — Add another minus to the same line. A 9:15 to 17:45 shift with a 30-minute lunch is 17h 45m - 9h 15m - 30m, which gives 8 Hours. Chain more minus signs to remove several breaks.

Full guide: https://www.timecalculator.app/guides/hours-worked-between-two-times

### How do I add and subtract time durations across units?
Type each duration with its unit on one line, separated by + or -, like "2 days - 4h" or "5h 30m + 2h 15m". The calculator handles mixed units for you, so you never convert to minutes first. Pick a result format such as Hour Minute or Day Hour Minute to read the answer.

Most time math goes wrong at the unit boundaries. You add 50 minutes to 40 minutes and have to remember it rolls past an hour, or you subtract 4 hours from 2 days and stall on the borrow. This tool keeps the units intact. You write the durations the way you say them, mix hours with days with weeks, and it carries and borrows across the boundaries on its own.

Steps:
1. Write each duration with its unit — Every number needs a unit attached. Use h or hour, m or minute, d or day, w or week, s or second. So you type 2 days, not 2, and 30m, not 30. You can glue parts together like 5h 30m to mean five hours and thirty minutes.
2. Join durations with + and - — Put a plus to add and a minus to subtract between durations, on one line. Chain as many as you like: 1w 3d + 2 days - 4h is valid. The units can differ at every step, so weeks, days, and hours sit side by side in the same expression.
3. Let it carry and borrow across units — You do not convert anything to minutes first. Subtract 4h from 2 days and the calculator borrows from the day for you. Add minutes past 60 and they roll into the next hour. The running total stays exact across every unit you mix in.
4. Choose how the result reads — Pick a format from the picker. Hour Minute gives an answer like 7 Hours 45 Minutes. Day Hour Minute breaks a long total into days and hours. Week Day groups it into weeks. The same expression can be read in whichever unit fits.

Worked examples:
- `5h 30m + 2h 15m` = 7 Hours 45 Minutes  (Adding two hour-and-minute durations; the minutes carry past 60 cleanly.)
- `2 days - 4h` = 1 Day 20 Hours  (Subtracting hours from days borrows across the unit boundary, no conversion needed.)
- `1 day + 12h 30m` = 1 Day 12 Hours 30 Minutes  (Mixing a whole day with hours and minutes in one expression.)
- `1w - 2d` = 5 Days  (Subtracting days from a week, read back in week and day terms.)

Questions:
- Do I have to convert everything to minutes first? — No. That is the point. You can write 2 days - 4h directly and the calculator borrows across the day, hour, and minute boundaries for you. Each number keeps its own unit, and the running total stays exact no matter which units you mix.
- Can I mix hours, days, and weeks in the same calculation? — Yes. An expression like 1w 3d + 2 days - 4h is valid. Units can differ at every step. The calculator combines them into one total, then shows it in whatever result format you pick, such as Day Hour Minute or Week Day.
- Why does my result show a decimal in some formats? — A format only carries down to its smallest listed unit. If you choose Week Day and the total has a leftover smaller than a day, it appears as a fraction of a day. Switch to Day Hour Minute or Hour Minute to see that remainder as whole hours and minutes.

Full guide: https://www.timecalculator.app/guides/add-and-subtract-time

### How do I total the hours on a weekly timesheet?
To total timesheet or time card hours, type each day's worked time as a duration and add them with plus signs on one line, like 8h 12m + 7h 48m + 8h 30m, then pick a result format such as Hour Minute. The calculator carries minutes over into whole hours and shows the weekly total instantly.

Adding hours and minutes by hand is where timesheets go wrong: 45 plus 50 minutes is not 95, it rolls into an extra hour. This calculator handles that carry for you. Type each shift as a duration, join them with plus signs, and read the weekly total. Drivers, hourly staff, and freelancers use the same one-line method every week.

Steps:
1. Write each day as a duration — For every day you worked, write the hours and minutes together: 8h 12m, 7h 48m, 9h 6m. Every number needs a unit, so use h for hours and m for minutes. There is no need to convert minutes to decimals first.
2. Join the days with plus signs — Put a + between each day on a single line: 8h 12m + 7h 48m + 8h 30m + 9h 6m + 7h 54m. Add as many days as you like. The order does not matter, and the calculator updates as you type.
3. Pick a result format — Choose Hour Minute for a normal weekly total. The calculator rolls extra minutes into whole hours automatically, so you never end up with 90-minute remainders. Use Day Hour Minute when a heavy week passes 24 hours of driving.
4. Adjust and reformat without retyping — Subtract an unpaid break with a minus sign, or switch the format to Minute to see the total in plain minutes for a payroll system. The same expression re-totals instantly in whichever unit you need.

Worked examples:
- `8h 12m + 7h 48m + 8h 30m + 9h 6m + 7h 54m` = 41 Hours 30 Minutes  (A standard five-day week summed into one clean total, minutes carried into hours.)
- `10h 30m + 9h 15m + 11h + 8h 45m + 10h 20m` = 2 Days 1 Hour 50 Minutes  (A heavy driving week passes 24 hours, so Day Hour Minute breaks it down clearly.)
- `8h 15m × 5` = 41 Hours 15 Minutes  (Five identical 8h 15m shifts multiplied by a plain number instead of adding each one.)
- `45h 50m - 5h` = 40 Hours 50 Minutes  (Subtract unpaid break time from a running weekly total with a minus sign.)

Questions:
- Do I have to convert minutes into decimals first? — No. Type minutes as minutes, like 7h 48m. The calculator handles the 60-minute carry itself, so 45m plus 50m correctly becomes 1 hour 35 minutes instead of 95.
- How do I subtract an unpaid lunch or break? — Use a minus sign in the same line. For example, 42h 30m - 30m removes a half-hour break, and the calculator returns the adjusted payable total.
- Can I see the total in plain hours or minutes for payroll? — Yes. Switch the result format. Pick Minute to get the whole week as a single minute count, or Hour Minute for hours and minutes. The same expression re-totals instantly.

Full guide: https://www.timecalculator.app/guides/timesheet-total-hours

### How do I multiply or split a time duration?
To multiply or split a duration, type the time block, then × or ÷ with a plain number: "8h 15m × 3" repeats the block three times, and "1 day ÷ 4" splits a day into four equal parts. Pick a result format like Hour Minute, and the calculator returns the total instantly.

Multiplying and dividing time is the awkward part of any time math, because you cannot just multiply hours and minutes separately the way you would whole numbers. This calculator handles the carrying for you. You type the block once, multiply by how many times it repeats, or divide by how many ways you are splitting it, and read the answer in whatever unit you need.

Steps:
1. Type the duration block — Write the time you want to repeat or split, with a unit on every number. For example, type "8h 15m" for an eight-and-a-quarter-hour shift, or "45m" for a short task. A bare number with no unit is only allowed as the multiplier or divisor.
2. Add × to multiply or ÷ to divide — Follow the block with × (or *) to repeat it, or ÷ (or /) to split it, then a plain number. "8h 15m × 3" repeats the block three times. "1 day ÷ 4" splits one day into four equal parts. The number after × or ÷ is always plain, never a duration.
3. Pick a result format — Choose how you want the answer shown from the format picker: Hour Minute, Day Hour Minute, Minute, Second, and more. The same total can read as hours and minutes, as total minutes, or as plain seconds, depending on what you need to record.
4. Read and reuse the result — The calculator carries minutes into hours and hours into days automatically, so the answer is always normalized. Chain more steps if needed, like multiplying a block and then subtracting a break, all on one line.

Worked examples:
- `8h 15m × 3` = 24 Hours 45 Minutes  (Repeats an 8h 15m shift three times; minutes carry into the hour total.)
- `1 day ÷ 4` = 6 Hours  (Splits one full day evenly four ways.)
- `45m × 6` = 4 Hours 30 Minutes  (Bills a 45-minute task across six clients.)
- `2h 30m × 4` = 10 Hours  (Four repeats of a 2h 30m block, shown as whole hours.)

Questions:
- Can I multiply two durations together, like 2 hours × 3 hours? — No. Multiplying two durations would give an area-like unit that is not time, so it is not allowed. The × and ÷ operators only work with a plain number, such as "2h 30m × 3" or "1 day ÷ 4". The number is the count of repeats or splits.
- What happens when a division does not come out evenly? — The calculator keeps the exact value and shows it in the format you pick. If you split a duration that does not divide cleanly into whole hours, choose a finer format like Minute or Second to see the precise remainder instead of a rounded figure.
- Do I need a unit on the multiplier? — No. The number after × or ÷ is a plain count, so "45m × 6" is correct, not "45m × 6m". Every other number in the expression does need a unit, like the 45m here.

Full guide: https://www.timecalculator.app/guides/multiply-and-divide-time

### How do I convert between time units like minutes to seconds or hours to minutes?
To convert a time unit, type the duration with its unit (like "90 min" or "2h 15m") and pick the output format you want, such as Second or Minute. The calculator restates the same length of time in the new units. It handles years down to milliseconds, all in one expression.

Converting time units is just restating one length of time in a different unit. Ninety minutes and 5,400 seconds are the same duration written two ways. This calculator does that translation for you: type the value and unit, choose how you want the answer displayed, and read the result. It supports years, months, weeks, days, hours, minutes, seconds, and milliseconds, which makes it useful for audio and video editing, software timing, and any work that crosses unit boundaries.

Steps:
1. Type the duration with its unit — Enter the value followed by its unit, like "90 min", "3h", or "250 ms". Every number needs a unit. You can also combine units in one line, such as "2h 30m", and the calculator treats the whole thing as a single duration.
2. Pick the output format — Open the result format picker and choose the unit you want the answer in. Pick "Second" to convert to seconds, "Minute" to convert to minutes, or "Hour" for hours. Multi-unit formats like "Day Hour Minute" break a long duration into parts.
3. Read the converted result — The result restates your duration in the chosen units. The underlying length never changes, only how it is displayed. Switch the format again at any time to see the same duration in another unit without retyping it.
4. Scale before converting if needed — Multiply or divide by a plain number first when you need a repeated or split duration, like "250 ms × 8" or "1 day ÷ 4". Then read the result in whatever unit fits, such as Second or Hour.

Worked examples:
- `90 min` = 5400 Seconds  (Minutes to seconds: a 90-minute audio mix as a raw second count.)
- `2h 15m` = 135 Minutes  (Hours and minutes flattened to a single minute total.)
- `3600 sec` = 1 Hour  (Seconds back up to hours, confirming 3,600 seconds is one hour.)
- `250 ms × 8` = 2 Seconds  (Eight 250 ms frames scaled up, then read in seconds.)

Questions:
- Can I convert milliseconds? — Yes. Type a value in milliseconds using "ms", like "1500 ms", and pick a format such as Second or Minute Second. Milliseconds make this useful for editing and software timing where sub-second precision matters.
- Do I have to type a unit on every number? — Yes. Each number needs a unit, so write "90 min" rather than "90". The only exception is the multiplier in × or ÷, where a plain number is expected, like "3h × 2".
- Can I convert in both directions? — Yes. The format picker works either way. Enter seconds and read hours, or enter hours and read seconds. The duration stays the same length; only the displayed unit changes.

Full guide: https://www.timecalculator.app/guides/convert-time-units

### Convert Time to Decimal Hours
To convert time to decimal hours, divide the minutes by 60 and add the whole hours. So 8h 15m becomes 8 + 15/60 = 8.25 hours. In the calculator, type the duration and pick the single "Hour" format to get the decimal directly: 15m is .25, 30m is .5, 45m is .75.

Most payroll and timesheet systems want hours as a decimal, not as hours and minutes. They expect 8.25, not 8h 15m. The conversion is just minutes divided by 60, added to the whole hours. The calculator does it for you: enter the duration and choose the single "Hour" result format to read the decimal straight off. The clean quarters are easy to memorize (15m = .25, 30m = .5, 45m = .75), but odd minute counts produce repeating decimals like 8.3333333, which payroll usually rounds to two places.

Steps:
1. Enter the duration with units — Type the worked time as a number-plus-unit duration, for example 8h 15m. Each value needs a unit; the engine reads hours and minutes, not clock times. If you started from a clock span, calculate that first (for example 17h 45m - 9h 15m) and convert the result.
2. Choose the single "Hour" format — Set the result format to "Hour". This single-unit format returns decimal hours instead of splitting the answer into hours and minutes. So 8h 15m reads as 8.25 Hours and 90 min reads as 1.5 Hours.
3. Read the quarter-hour shortcuts — Quarter hours convert to clean decimals: 15m = .25, 30m = .5, 45m = .75. Any whole-hour amount plus one of these stays exact, so 8h 30m is 8.5 and 8h 45m is 8.75. These are worth memorizing for quick timesheet checks.
4. Round repeating decimals for payroll — Odd minute counts do not divide evenly by 60, so they produce repeating decimals. The engine shows 7 digits, so 8h 20m becomes 8.3333333 Hours. Payroll systems usually round to 2 decimal places, making that 8.33. Round only the final total, not each daily figure, to avoid drift.

Worked examples:
- `8h 15m` = 8.25 Hours  (A standard shift with a quarter hour, the classic payroll example.)
- `8h 45m` = 8.75 Hours  (Three quarters of an hour converts to a clean .75 decimal.)
- `8h 20m` = 8.3333333 Hours  (An odd minute count gives a repeating decimal that payroll rounds to 8.33.)
- `8h 15m` = 495 Minutes  (Same shift shown as total minutes if your system wants minutes instead.)

Questions:
- How do I convert hours and minutes to decimal hours? — Divide the minutes by 60 and add the whole hours. For 8h 15m, that is 8 + 15/60 = 8.25. In the calculator, type the duration and select the single "Hour" format to get the decimal automatically.
- Why is 8h 15m equal to 8.25 and not 8.15? — Decimal hours are fractions of an hour, not the minute count written after a dot. 15 minutes is a quarter of an hour, which is 0.25, so 8h 15m is 8.25 hours. The 15 is not the decimal; 15/60 is.
- What are 15, 30, and 45 minutes in decimal? — 15 minutes is .25, 30 minutes is .5, and 45 minutes is .75. These are the quarter-hour values, the most common conversions on a timesheet. So 6h 30m is 6.5 and 2h 45m is 2.75.
- Why does 8h 20m show 8.3333333? — 20 minutes is 20/60 of an hour, which is 0.3333... repeating. The calculator displays 7 digits, so you see 8.3333333. Payroll systems round this to two places, giving 8.33.
- Can I convert a duration to total minutes instead? — Yes. Use the single "Minute" format and the result comes back as total minutes. For example, 8h 15m returns 495 Minutes, useful when a system tracks minutes rather than decimal hours.

Full guide: https://www.timecalculator.app/guides/convert-time-to-decimal

### How to Calculate the Time Between Two Times
Write each clock time as a duration from midnight, then subtract the earlier from the later. 5:30 PM minus 9:15 AM becomes "17h 45m - 9h 15m", which equals 8h 30m. If the span crosses midnight, add 24h to the end time before subtracting.

You want to know how long something lasted: a parking session, an oven timer, a study block, or a long flight. The trick is to stop thinking in clock labels and start thinking in durations. Convert each clock time into hours and minutes counted from midnight, then subtract the start from the end. This calculator does duration math only. It has no concept of "now", today's date, or the calendar, so it answers "how long between these two times" but not "what time is it after this delay".

Steps:
1. Turn each clock time into a duration from midnight — Read each time off the clock and rewrite it as hours and minutes since 12:00 midnight. 9:15 AM becomes 9h 15m. 5:45 PM becomes 17h 45m, because afternoon hours keep counting up: 1 PM is 13, 2 PM is 14, and so on. Midnight itself is 0h. This is the step that lets a plain subtraction work.
2. Subtract the earlier time from the later time — Put the later duration first and subtract the earlier one: "17h 45m - 9h 15m". The calculator handles the minute borrowing for you, so you never have to convert to a decimal or borrow 60 minutes by hand. The result is the elapsed time, for example 8h 30m.
3. If the span crosses midnight, add 24h to the end — When the end time is on the next day, such as parking from 10:30 PM to 6:15 AM, add 24h to the end before subtracting: "6h 15m + 24h - 22h 30m". The 24h represents one full day, so the math lands on the real overnight length instead of a negative number.
4. Pick the result format you want to read — Choose Hour Minute for a clean "8 hours 30 minutes" readout, or switch to the single Hour format to get decimal hours like 8.5 for spreadsheets and billing. The Minute format gives the whole span as total minutes, handy for timers and cooking.

Worked examples:
- `14h 20m - 9h 45m` = 4 Hours 35 Minutes  (Parking session from 9:45 AM to 2:20 PM.)
- `19h 50m - 19h 05m` = 45 Minutes  (Oven timer set at 7:05 PM and pulled at 7:50 PM.)
- `16h 30m - 13h 15m` = 3.25 Hours  (An afternoon study block from 1:15 PM to 4:30 PM, in decimal hours.)
- `6h 15m + 24h - 22h 30m` = 7 Hours 45 Minutes  (An overnight stretch from 10:30 PM to 6:15 AM the next morning.)

Questions:
- How do I calculate the time between two times? — Write each clock time as a duration from midnight, then subtract the earlier from the later. For 9:15 AM to 5:45 PM, enter "17h 45m - 9h 15m" to get 8h 30m. The calculator does the minute borrowing, so you do not convert anything by hand.
- What if the second time is on the next day? — Add 24h to the end time before subtracting. A span from 10:30 PM to 6:15 AM becomes "6h 15m + 24h - 22h 30m", which equals 7h 45m. The 24h stands in for the full day that passed overnight.
- Can it tell me what time it will be in 3 hours? — No. This is a duration calculator. It measures how long a span lasts when you give it both ends, but it has no idea what time it is now and cannot add a delay to the current clock or to a calendar date.
- How do I get the answer in decimal hours? — Use the single Hour format. A 3 hour 15 minute span shows as 3.25 Hours, and 45 minutes shows as 0.75 Hours. This is the format to use for timesheets, billing, or any spreadsheet that expects a decimal.

Full guide: https://www.timecalculator.app/guides/time-between-two-times

### Add Up Video and Audio Lengths (mm:ss and Milliseconds)
To total video or audio lengths, enter each clip as minutes and seconds and add them: "2m 45s + 3m 12s + 1m 58s" returns 7 Minutes 55 Seconds in the Minute Second format. The seconds roll into minutes automatically, and minutes roll into hours when you pick the Hour Minute Second format.

Editors, podcasters, and musicians stack clip and track lengths constantly, and the math is annoying because 45s plus 30s is not 75, it is 1:15. This calculator carries seconds into minutes and minutes into hours for you. Enter each length as a number plus a unit, add them, and read the total in whichever mm:ss or h:mm:ss format you need. It also works in milliseconds, which most time calculators drop. The web version is free and ad-supported, running the same engine as the mobile apps.

Steps:
1. Type each clip as minutes and seconds — Write a length as a number and a unit with no colon: a 2:45 clip is "2m 45s", a 12-second sting is "12s". Use "m" for minutes and "s" for seconds. A bare number is only allowed as a multiplier, so always attach a unit to each length.
2. Add them with the plus sign — Chain the clips with +, for example "2m 45s + 3m 12s + 1m 58s". The engine sums everything in the background and carries 60 seconds up into a minute, so you never have to fix overflowing seconds by hand.
3. Pick Minute Second for short reels — Set the result format to Minute Second to read totals as whole minutes and seconds, like 7 Minutes 55 Seconds. This is the format you want for a single reel, a song, or a short clip stack that stays under an hour.
4. Switch to Hour Minute Second once you cross an hour — For a full playlist or episode, choose Hour Minute Second. A four-clip set like "18m 30s + 22m 15s + 12m 45s + 14m 50s" reads 1 Hour 8 Minutes 20 Seconds, with the minutes rolling cleanly into one hour.
5. Work in milliseconds for audio and frames — Add the ms unit for sub-second precision most calculators skip. Use "1s - 250ms" to find a 750 ms gap, or multiply a frame duration: "41ms * 30" with the Hour Minute Second MSecond format gives 0 Hours 0 Minutes 1 Second 230 MSeconds. Pick a format ending in MSecond to keep the millisecond digits.

Worked examples:
- `2m 45s + 3m 12s + 1m 58s` = 7 Minutes 55 Seconds  (Total three short clips for a reel; seconds carry into minutes automatically.)
- `18m 30s + 22m 15s + 12m 45s + 14m 50s` = 1 Hour 8 Minutes 20 Seconds  (Sum a playlist of segments that crosses the one-hour mark.)
- `1s - 250ms` = 750 MSeconds  (Find the millisecond gap left after trimming a quarter-second from a one-second cue.)
- `41ms * 30` = 1 Second 230 MSeconds  (Multiply one frame at 41 ms by 30 frames to get the clip length to the millisecond.)

Questions:
- How do I total clip lengths in mm:ss? — Type each clip as minutes and seconds with a unit, like "3m 20s", join them with +, and set the result format to Minute Second. The calculator carries every 60 seconds into a minute, so "3m 20s + 2m 50s" returns 6 Minutes 10 Seconds rather than 5:70.
- What if my total goes over an hour? — Switch the result format to Hour Minute Second. The same sum then rolls 60 minutes into an hour, so a long playlist shows as something like 1 Hour 8 Minutes 20 Seconds instead of 68 minutes.
- Can it handle milliseconds? — Yes. Use the ms unit, which many time calculators lack. You can compute "1s - 250ms" to get 750 MSeconds, or multiply a frame or sample duration. Pick any result format ending in MSecond to keep the millisecond digits visible.
- Why do I have to add a unit to every number? — Each value needs a unit so the engine knows whether 3 means minutes, seconds, or milliseconds. A bare number is only valid as a multiplier or divisor, as in "41ms * 30" or "6m / 2". "2 + 2" alone is not a valid time expression.
- Does this know the actual clock time or release date? — No. It works with durations only. It adds, subtracts, multiplies, and divides lengths of time. It does not track wall-clock time, calendar dates, or the current moment, so it cannot tell you when a render will finish in real time.

Full guide: https://www.timecalculator.app/guides/add-video-audio-lengths

### Billable Hours Calculator
To calculate billable hours, add each session duration with the + operator (for example 1h 15m + 45m + 2h 30m = 4h 30m), then switch the result format to the single "Hour" option to get the decimal total, 4.5 hours. Invoices and billing software expect decimals, so this converts your tracked time directly.

Freelancers, lawyers, and agencies bill in decimal hours, not hours and minutes. Most invoicing tools want 4.5, not 4h 30m. This calculator adds every tracked session, multiplies repeated tasks, and converts the total to a clean decimal you can drop straight into an invoice. Everything stays as duration math, so the engine handles the rounding for you.

Steps:
1. Enter each session as a duration — Type every work block with a unit attached: 1h 15m for a meeting, 45m for a call, 2h 30m for deep work. Hours use h, minutes use m. Each value needs a unit, so write 45m, not a bare 45.
2. Add the sessions with + — Join the durations with the plus operator: 1h 15m + 45m + 2h 30m. The calculator returns 4h 30m. Keep stacking sessions across the day or the week the same way to build one running total.
3. Multiply any repeated task — For a task that ran several times at the same length, multiply instead of retyping it. Six 25-minute calls become 25m * 6, which equals 2h 30m. The count is a bare number because it acts as a multiplier.
4. Switch the result to decimal hours — Set the result format to the single "Hour" option. Your 4h 30m total becomes 4.5 hours, and 8h 15m becomes 8.25 hours. This is the figure invoices and billing software expect, so copy it straight onto the line item.
5. Apply your rate — Use the rate panel to multiply the decimal total by your hourly rate and read the money amount, or paste the decimal hours into your own invoicing tool. The time result itself never includes currency, so the rate panel is where the dollar figure appears.

Worked examples:
- `1h 15m + 45m + 2h 30m` = 4 Hours 30 Minutes  (Add three client sessions logged in one day to see the running total.)
- `1h 15m + 45m + 2h 30m` = 4.5 Hours  (Same total shown as decimal hours, ready to type onto an invoice.)
- `25m * 6` = 2 Hours 30 Minutes  (Bill a repeated 25-minute support call that happened six times.)
- `25m * 6` = 2.5 Hours  (The same repeated block as a decimal for the line item.)

Questions:
- How do I total my billable hours? — Enter each session as a duration and join them with the + operator, like 1h 15m + 45m + 2h 30m. The calculator returns the combined total, 4h 30m. Keep every value tagged with a unit (h for hours, m for minutes) so the engine reads it correctly.
- How do I convert billable time to decimal hours? — Calculate your total, then set the result format to the single "Hour" option. A total of 4h 30m becomes 4.5 hours, and 8h 15m becomes 8.25 hours. Totals that do not divide evenly show seven digits, so 1h 20m reads 1.3333333 hours.
- How do I bill the same task repeated several times? — Multiply one session by the count. For six 25-minute calls, type 25m * 6 to get 2h 30m, or 2.5 hours in decimal format. A bare number is allowed only as a multiplier or divisor, so the unit stays on the duration.
- Can the calculator turn my hours into a money amount? — Yes. The calculator has a rate panel that multiplies a duration by your hourly rate to show a dollar figure. The plain result string only reports time, so use the decimal hours total there or paste it into your invoicing software.

Full guide: https://www.timecalculator.app/guides/billable-hours

### How do I use a time card calculator to total payable hours?
A time card calculator turns clock-in and clock-out punches into payable hours. Write each punch as hours and minutes from midnight, subtract clock-in from clock-out, then subtract the break: 16h 48m - 8h 12m - 30m gives 8 Hours 6 Minutes. Add the days with plus signs and pick the Hour format for a decimal payroll total.

A punch time card gives you pairs of clock times, and payroll wants one number. The method is the same on every row: write each punch as hours and minutes counted from midnight, subtract the clock-in from the clock-out, then take off the unpaid break. That leaves one day's payable span, like 8h 6m. Add the spans with plus signs for the weekly total, and switch the result format to Hour when your payroll software wants decimal hours.

Steps:
1. Turn each punch pair into a span — Write every punch as hours and minutes counted from midnight on a 24-hour clock, so an 8:12 clock-in is 8h 12m and a 4:48 p.m. clock-out is 16h 48m. Subtract the in from the out: 16h 48m - 8h 12m gives 8 Hours 36 Minutes for that row of the card.
2. Subtract the breaks on the same line — Chain a minus for every unpaid break the card shows. A 30-minute lunch makes the line 16h 48m - 8h 12m - 30m, which returns 8 Hours 6 Minutes of payable time. Use - 1h for a full-hour break, and add more minus signs for a second break.
3. Add the days into a weekly total — Join each day's payable span with plus signs: 8h 6m + 7h 51m + 8h 24m + 8h + 7h 57m totals 40 Hours 18 Minutes. Order does not matter, and an overtime week can carry a sixth or seventh span on the same line.
4. Convert the total to decimal hours for payroll — Payroll software wants 40.3, not 40h 18m. Switch the result format to Hour and the same expression reads 40.3 Hours, because 18 minutes is 18 ÷ 60 = 0.3 of an hour. Nothing gets retyped; only the format changes.

Worked examples:
- `16h 48m - 8h 12m - 30m` = 8 Hours 6 Minutes  (One card row: an 8:12 clock-in, a 16:48 clock-out, and a 30-minute unpaid lunch.)
- `12h - 8h + 17h 30m - 13h` = 8 Hours 30 Minutes  (A split-shift card with two punch pairs, 8:00 to 12:00 and 13:00 to 17:30, on one line.)
- `8h 6m + 7h 51m + 8h 24m + 8h + 7h 57m` = 40 Hours 18 Minutes  (Five daily payable spans from the card summed into the weekly total.)
- `8h 6m + 7h 51m + 8h 24m + 8h + 7h 57m` = 40.3 Hours  (The same week as decimal hours, ready to type into payroll software.)

Questions:
- Can I type the punch times with a colon, like 8:12? — Not with a colon. Write each punch as hours and minutes counted from midnight, so 8:12 becomes 8h 12m and 4:48 p.m. becomes 16h 48m. Then subtract: 16h 48m - 8h 12m gives 8 Hours 36 Minutes, the span for that row of the card.
- How do I subtract a 30-minute or one-hour lunch? — Chain another minus on the same line. 16h 48m - 8h 12m - 30m removes a half-hour lunch and returns 8 Hours 6 Minutes. Use - 1h for a full hour, and keep adding minus signs if the card shows more than one break.
- How do I get decimal hours for payroll software? — Switch the result format to Hour. The weekly line 8h 6m + 7h 51m + 8h 24m + 8h + 7h 57m then reads 40.3 Hours instead of 40 Hours 18 Minutes, because 18 minutes is 18 ÷ 60 = 0.3 of an hour.
- What about a shift that crosses midnight? — Add 24h to the clock-out, since it lands on the next day. A card showing 22:00 in and 6:30 out is 6h 30m + 24h - 22h, which gives 8 Hours 30 Minutes. Without the +24h the subtraction would go negative.

Full guide: https://www.timecalculator.app/guides/time-card-calculator

### Work Hours Calculator: How Many Hours Did I Work?
A work hours calculator adds your shifts as durations: type 8h 15m + 7h 45m + 8h on one line and read 24 Hours. Subtract breaks with a minus sign, then pick Hour Minute for an hours-and-minutes total, or the single Hour format for the decimal hours payroll systems expect.

Whether you finished three shifts or a full week, the question is the same: how many hours did I work? This work hours calculator answers it in one line. Type each shift as a duration, like 8h 15m, join the shifts with plus signs, and subtract any unpaid breaks. Pick Hour Minute to read the total the way a time card shows it, or the single Hour format when payroll wants decimal hours. The calculator carries every 60 minutes into an hour, so 45 minutes plus 30 minutes lands as 1 hour 15 minutes on the total.

Steps:
1. Write each shift as hours and minutes — Type every shift as a duration with a unit on each number: an 8-hour-15-minute day is 8h 15m, a straight 8-hour day is 8h. Write the worked length, so a 9-hour day with a 45-minute unpaid lunch becomes 9h - 45m.
2. Chain the shifts with plus signs — Put a + between shifts and keep the whole day or week on one line: 8h 15m + 7h 45m + 8h totals three days. Add all five days for the week, and use a minus sign anywhere in the line to remove unpaid breaks.
3. Read the total as hours and minutes — Pick Hour Minute to see the total the way a time card reads it, like 40 Hours 15 Minutes. The calculator carries every 60 minutes into an hour, so a stack of odd shift lengths still comes out as a clean total.
4. Switch to decimal hours for payroll — Change the format to the single Hour option when your payroll system wants a decimal. The same week reads 40.25 Hours, since 15 minutes is a quarter of an hour. Round repeating decimals like 8.3333333 to two places at the end.

Worked examples:
- `8h 15m + 7h 45m + 8h` = 24 Hours  (Three daily shifts added into one running total.)
- `8h 15m + 7h 45m + 8h + 8h 30m + 7h 45m` = 40 Hours 15 Minutes  (A full five-day week totaled the way a time card reads.)
- `8h 15m + 7h 45m + 8h + 8h 30m + 7h 45m` = 40.25 Hours  (The same week as decimal hours, the figure payroll software expects.)
- `9h - 45m` = 8 Hours 15 Minutes  (A 9-hour day with the unpaid 45-minute lunch removed.)

Questions:
- How do I calculate my work hours for the week? — Type each day's shift as a duration and add them on one line: 8h 15m + 7h 45m + 8h + 8h 30m + 7h 45m returns 40 Hours 15 Minutes. The calculator carries minutes into hours, so you skip the column arithmetic.
- How do I get my work hours as decimal hours for payroll? — Switch the result format to the single Hour option. A 40 hour 15 minute week reads 40.25 Hours. Odd minute counts produce repeating decimals, so 8h 20m shows 8.3333333 Hours, which payroll rounds to 8.33.
- How do I subtract an unpaid lunch break? — Use a minus sign in the same line. A 9-hour day with a 45-minute unpaid lunch is 9h - 45m, which returns 8 Hours 15 Minutes. Chain more minus signs to remove several breaks across the week.
- I only have clock-in and clock-out times. Can I still calculate my hours? — Yes. Write each clock time as hours and minutes counted from midnight and subtract: a 9:00 to 17:30 day is 17h 30m - 9h, which gives 8 Hours 30 Minutes. Total those shift lengths with plus signs afterward.

Full guide: https://www.timecalculator.app/guides/work-hours-calculator

### Overtime Calculator: Hours Over the 40-Hour Week
An overtime calculator subtracts the standard week from your total hours worked. Type 43h 45m - 40h and the result is 3 Hours 45 Minutes of overtime. For daily overtime, subtract 8h from the shift. Switch the format to the single "Hour" option to read the same overtime as 3.75 Hours for pay math.

Overtime is what remains after the standard week comes out of your total hours. Under the US federal rule the threshold is 40 hours per week, so the math is one subtraction: total worked minus 40h. The catch is that timesheet totals arrive in hours and minutes, and subtracting 40 from 43h 45m by hand invites a borrow slip at the end of a pay period. Type the subtraction into the calculator instead, read the overtime in hours and minutes for the record, then switch to decimal hours when payroll needs a number to multiply.

Steps:
1. Total the week and subtract 40h in one line — Add each day's shift with plus signs, then append - 40h to the same line: 8h 30m + 9h 15m + 8h + 9h + 9h - 40h. The calculator totals the week to 43h 45m, takes off the standard 40 hours, and returns 3 Hours 45 Minutes of overtime in one pass.
2. Start from a weekly total if you have one — If the timesheet already shows the week as one number, type it as a duration and subtract: 43h 45m - 40h gives 3 Hours 45 Minutes. A negative answer means the week stayed under 40 hours, so there is no weekly overtime to pay.
3. Check daily overtime against an 8-hour day — Some states, California among them, count overtime per day once a shift passes 8 hours. Subtract the threshold from the single shift: 9h 30m - 8h gives 1 Hour 30 Minutes. Run the same subtraction on each long day, then add the results with plus signs.
4. Read the overtime as decimal hours for pay — Switch the result format to the single "Hour" option and 43h 45m - 40h reads as 3.75 Hours. Payroll multiplies that decimal by 1.5 times the hourly rate for time and a half. The calculator computes the hours; the currency step belongs to your payroll system.

Worked examples:
- `43h 45m - 40h` = 3 Hours 45 Minutes  (A 43 hour 45 minute week minus the standard 40-hour week leaves the overtime.)
- `8h 30m + 9h 15m + 8h + 9h + 9h - 40h` = 3 Hours 45 Minutes  (Five daily shifts totaled and the standard week subtracted in one line.)
- `43h 45m - 40h` = 3.75 Hours  (The same overtime as a decimal, ready for the 1.5x rate multiplication in payroll.)
- `9h 30m - 8h` = 1 Hour 30 Minutes  (Daily overtime: a 9 hour 30 minute shift measured against an 8-hour day.)
- `3h 45m * 1.5` = 5.625 Hours  (Time and a half as duration math: multiplying the 3.75 overtime hours by 1.5 gives the equivalent straight-time hours.)

Questions:
- How do I calculate my overtime hours for the week? — Subtract the standard 40-hour week from your total hours worked. Type 43h 45m - 40h to get 3 Hours 45 Minutes, or build the total and the subtraction into one line: 8h 30m + 9h 15m + 8h + 9h + 9h - 40h returns the same answer.
- What happens if I worked under 40 hours? — The subtraction goes negative. 38h 30m - 40h returns -1 Hours -30 Minutes, meaning the week fell 1 hour 30 minutes short of the threshold, so there is no weekly overtime. Daily overtime can still apply if a single shift ran past 8 hours.
- How does the overtime number turn into time-and-a-half pay? — Read the overtime in the single "Hour" format to get a decimal like 3.75 Hours, then payroll multiplies that by 1.5 times the hourly rate. The calculator works in hours only. To see the time itself scaled, multiply the duration: 3h 45m * 1.5 gives 5.625 Hours.
- Does daily overtime work the same way? — Yes, with an 8h threshold per shift in place of 40h per week. Subtract it from each day: 9h 30m - 8h gives 1 Hour 30 Minutes, which reads as 1.5 Hours in the decimal "Hour" format. Swap in - 12h where double-time rules start at 12 hours.

Full guide: https://www.timecalculator.app/guides/overtime-calculator

### How do I subtract lunch break from work hours?
Subtract lunch break from work hours by typing the full shift span, then removing each unpaid break with a minus sign: 9h - 45m returns 8 Hours 15 Minutes. Chain more minuses for extra breaks, like 8h 30m - 30m - 15m, and pick a result format such as Hour Minute or decimal Hour.

An 8:30 to 17:30 shift looks like nine hours on paper, but 45 minutes of it is an unpaid lunch, so only 8 hours 15 minutes counts as work. Doing that subtraction by hand means a borrow across the hour boundary, and a second rest break makes the borrow worse. This calculator takes the whole line at once: type the shift span, put a minus sign before every unpaid break, and read the paid total in the format your payroll expects.

Steps:
1. Start with the full shift span — Write the whole clock-in to clock-out span as one duration: a nine hour day is 9h, an eight-and-a-half hour day is 8h 30m. If you only know the clock times, subtract them in the same line, so 17h 30m - 8h 30m returns 9 Hours to deduct from.
2. Put a minus sign before every unpaid break — Deduct the lunch with a minus: 9h - 45m leaves 8 Hours 15 Minutes of paid time. Chain another minus for each extra break, so a half-hour lunch plus a 15 minute rest becomes 8h 30m - 30m - 15m. The calculator borrows across the hour boundary for you.
3. Chain the whole week on one line — Alternate plus and minus to net out every day at once. Each plus adds a shift span and each minus removes that day's break: 9h - 45m + 8h 30m - 30m + 9h - 45m covers three days and three lunches and returns 24 Hours 30 Minutes.
4. Pick the format your payroll expects — Hour Minute reads like 8 Hours 15 Minutes. Switch to Hour when payroll wants a decimal to multiply by a pay rate: the same 9h - 45m shows 8.25 Hours. One expression feeds both views, so change the picker instead of retyping.

Worked examples:
- `9h - 45m` = 8 Hours 15 Minutes  (A nine hour shift span with a 45-minute unpaid lunch deducted.)
- `8h 30m - 30m - 15m` = 7 Hours 45 Minutes  (One shift minus a half-hour lunch and a 15-minute rest break, chained with two minus signs.)
- `9h - 45m + 8h 30m - 30m + 9h - 45m + 8h - 30m + 9h 15m - 45m` = 40 Hours 30 Minutes  (A five-day week on one line: each plus adds a shift span, each minus removes that day's unpaid break.)
- `9h - 45m` = 8.25 Hours  (The same shift as decimal hours, ready to multiply by an hourly pay rate.)

Questions:
- Do I subtract paid breaks too? — No. Deduct only unpaid time. If your employer pays for a 15 minute rest break, leave it inside the span and remove the unpaid lunch alone: 8h 30m - 30m returns 8 Hours of paid time. Check your contract for which breaks count as unpaid.
- I only have clock-in and clock-out times. Can I still deduct the break? — Yes, in one line. Write each clock time as hours and minutes from midnight, then chain the subtraction: an 8:30 to 17:15 shift with a 45 minute lunch is 17h 15m - 8h 30m - 45m, which returns 8 Hours.
- How do I deduct breaks from a whole week of hours? — Chain the days with plus signs and the breaks with minus signs on a single line. 9h - 45m + 8h 30m - 30m + 9h - 45m nets out three days at once and returns 24 Hours 30 Minutes. Extend the same pattern to five days.
- What if the break is bigger than the minutes on the clock? — The calculator borrows from the hour. 9h 15m - 30m returns 8 Hours 45 Minutes, with the borrow across the 60 minute boundary handled for you, so the minutes column never goes negative.

Full guide: https://www.timecalculator.app/guides/subtract-breaks-from-work-hours

## Mobile app
Time Calculator Cardamon is free on Google Play and the App Store. It runs the same engine as the website, so a sum like "8h 15m × 3" gives the exact same answer on your phone. The Android app has no ads and no sign-up, and your work timesheets are one tap away on your home screen.

Use cases:
- Work timesheets: Add up clock-in and clock-out blocks across a week and read the total in hours and minutes.
- Drivers logging hours: Truck and transport drivers track on-duty, drive, and break time without converting everything to minutes first.
- Audio and video editing: Work down to the millisecond, add clip lengths, and split a runtime into even segments.
- Billing and splitting time: Multiply a rate block by a number or divide a task evenly, like "1 day ÷ 4" for four people.
- Developers and converting: Convert a duration between days, hours, minutes, and seconds, then switch the result format to match your code.
- Everyday math: Cooking timers, workout sets, and fasting windows add up fast when you can type "16h - 90m" and just read the answer.

Features:
- A fast keypad of number keys and time-unit keys, with the answer updating as you tap
- Add, subtract, multiply by a number, and divide durations
- Works in years, months, weeks, days, hours, minutes, seconds, and milliseconds
- Pick how the result reads: Hour Minute, Day Hour Minute, Minute Second, and more
- Customise the keypad: presets like Stopwatch or Media, or your own choice of unit keys
- Same engine as the website, so answers match down to the millisecond
- Light, dark, and system themes; resize the display with a draggable divider
- Android is free with no ads and no account required

Why the app:
- One tap from your home screen, no browser or URL to find
- Works offline, so it keeps calculating with no signal on the job site
- Your calculation history stays saved on your device
- No ads and nothing tracking your sums; the math stays on your phone
- Faster keypad built for thumbs, with a layout you can resize to fit your hand

Google Play: https://play.google.com/store/apps/details?id=com.dmitriykargashin.cardamontimecalculator
Apple App Store: coming soon

## What's new (app)
Version 2.4.0: a customisable keypad with one-tap presets (Standard, Stopwatch, Media, Hours & minutes, Calendar, Everything) and a live preview; calculation history saved on your device with per-entry notes; quick result actions (copy, change format, rate, share); a redesigned rate calculator; more result formats including milliseconds; and smoother resizing.

## Reviews
4.6/5 from 391 ratings on Google Play (256 written). Selected reviews:
- "Superb app for time calculation.I really want this app so No any items and ads only need things" — priyankara serasinghe (5/5, Jul 12, 2023)
- "Solid app. Does exactly what I need it to. 5/5 😊" — Josh Lucio (5/5, Feb 23, 2023)
- "Love the app, makes doing my timesheets for work so much easier" — sharon lloyd (5/5, May 2, 2022)
- "The only time calculator app with milli second I found" — debest autofix (5/5, Mar 10, 2022)
- "very good app easy to use and no ads loved it" — Mayank Bumtariya (5/5, Feb 25, 2022)
- "Love this time-based calculator that have optional units of time!" — William Westerso (4/5, Feb 5, 2022)
- "A good time calculator that correctly converts to days, hours, minutes, and seconds. Most calculators display 4.156 days in a simplified format, but this one shows 4 days, 3 hours, 44 minutes, and 38.4 seconds. You can choose a different format. I liked it, even with the simple interface." — Константин Матвеенко (5/5, Jan 26, 2022)
- "Very simple and straightforward layout. So far it's worked flawlessly for me. Its able to do any type of time calculation that I would ever need with ease. No ads either! What else could you ask for. Love it!" — One Room Shed (5/5, Jan 18, 2022)
- "Great application, very simple and functional!" — Antonio Lombardi (5/5, Nov 18, 2021)
- "I should've given this a 5 but the only thing lacking is that, there's no way to view your previous conversion. And in case you will use it again, you have no choice but to retype it from scratch. Hope they add feature like that. Overall, I'm satisfied of how simple it is. Easy and very functional to use." — Zachary Moises Babagonio (4/5, Oct 27, 2021)
- "Worked for me as to convert MINUTES & SECONDS to SECONDS I.E. 5 MINUTES and 23 SECONDS EQUALS 323 SECONDS" — Johann De Beer (5/5, Oct 24, 2021)
- "Efficient, simple, no unnecessary features, no bugs" — Hervé L (5/5, Oct 14, 2021)
- "Awesome....ads free ....so I gave him 1 cup ....worth of 29 rupees...🤗😚" — Aalok andaz (5/5, Sep 26, 2021)
- "I find the app helpful when I'm in a rush and I need to figure out how much time that I have been doing on certain items I find app very reliable and worth the time to download" — Arlem O'dwyer (5/5, Sep 17, 2021)
- "As a truck driver, it's important to keep track of all the different times you've worked. Very practical." — Carlos Llopis Espadero (5/5, Sep 7, 2021)
- "Thanks, that helped me even though it's in English. Well, I'm good at English, so it's fine. I'll give it 5 stars; very promising." — Amine Faska (5/5, Sep 5, 2021)
- "Very well done, it allows for practically infinite calculations" — Davide Stenico (5/5, Aug 5, 2021)
- "It's user friendly and easy to use. One look you already how to use it." — Joe An (5/5, Aug 1, 2021)
- "This app is great. It takes out the guess work and is user friendly. Thank you." — Sarah Marshall (5/5, Jul 15, 2021)
- "Although I take breaks when things get too hard, I always come back." — Gian Bongcawill (5/5, May 27, 2021)
- "unistall and reinstalled once again its working now earlier i was unable to click on day minutes hours button now after reinstalling its working fine." — Astrologer Vinet Parekh (5/5, May 18, 2021)
- "Very wonderful and very easy to use. Excellent app!! Very handy!! Thank you!!!....." — France Barrientos (5/5, May 6, 2021)
- "Handy tool to convert time between different formats, e.g. for software developers" — John Berghof (5/5, Apr 30, 2021)
- "this is a very nice useful and top calculator app" — Abdulwarith Olawepo (5/5, Apr 29, 2021)
- "Beautiful camera nice.. I love it. This is amazing calculator for me i rate 5 star!!" — Adriane Cipriano (5/5, Apr 28, 2021)
- "Simple and easy, keeps you active during wait times at the doctors." — maryalyssa Flores (5/5, Apr 27, 2021)
- "Nice app i got 5 stars that will give it you.." — Maruf Ahmed Khan (5/5, Apr 26, 2021)
- "I honestly don't see any flaws about it,so good job creators." — Mad Max (5/5, Apr 26, 2021)
- "I was truly surprised; it's an excellent app. It allows you to calculate time however you like. Well thought out!" — Régulo Luna (5/5, Apr 26, 2021)
- "I like this app because you can divide multiply subtract and addition the time 😍" — Slimmy Jimmy (5/5, Apr 26, 2021)
- "Best time calculator app.. easy to use and i love it" — Rosan Roxas (5/5, Apr 22, 2021)
- "Now my phone performance has increased bigly because of this wonderful app" — anthony solorzano (5/5, Apr 22, 2021)
- "best time calculator apps in the playstore, this apps have fast calculate time, and not distrup appropriate as, i like this" — arif khan (5/5, Apr 17, 2021)
- "The most useful and convenient time converter and calculator imo." — Леснов Кирилл (5/5, Apr 16, 2021)
- "Everything is very convenient, but how do I make it Russian? If there isn't a Russian version, please add it or tell me how to make it Russian. 🙂" — Nika (5/5, Apr 10, 2021)
- "The app can convert time to different formats. I like feature for choosing result format." — Jessielou Lagman (5/5, Apr 8, 2021)
- "I'm a truck driver I'm using the app to calculate my work hours and miles. It really helps me." — Mary Jane Graf ᴅᴇ (5/5, Apr 8, 2021)
- "Super, convenient app. Please add history feature! and i love this apps so much 🥰🥰its so very nice 🥰" — Stalker Gaming (5/5, Apr 8, 2021)
- "It's an excellent calculator, I give it a 100." — Jerson Vega (5/5, Apr 6, 2021)
- "The best of all the apps. Highly recommended." — TEAM APP (5/5, Apr 6, 2021)
- "Finally i found the cool time calculator! thanks!!" — Ibrheem Balogun (5/5, Apr 6, 2021)
- "Super, convinient app. Please add history feature" — Rouxanne Macoco (5/5, Apr 4, 2021)
- "Time calculator is best app to convert time. Nice work!" — Kerry Jennifer (5/5, Mar 30, 2021)
- "It's an excellent calculator with many features. I highly recommend it; download it!" — Sindy Buelvas Márquez (5/5, Mar 29, 2021)
- "great and simple this application revcommended" — aldrian julieanne (5/5, Mar 28, 2021)
- "exactly what I was looking for! ps.. come in!! look at you!!" — Jeannelyn Sy (5/5, Mar 27, 2021)
- "omg best application! im search time application..thanks made for it" — Nibedita Roy (5/5, Mar 20, 2021)
- "A handy calculator. A dark theme would be nice." — Step by Step (5/5, Mar 7, 2021)
- "Great idea. Excellent execution. Everything works well. The description is accurate. The author is a good person. Five stars. I recommend." — Google Play user (5/5, Mar 24, 2020)
- "A very useful app, especially the conversion between different units of time is very practical!" — Google Play user (5/5, Feb 23, 2020)
- "Nice app with good UI so it's easy to use. Well done" — Google Play user (5/5, Jan 24, 2020)
- "OMG, this app is wonderful)Thank you so much Cardamon" — Google Play user (5/5, Nov 5, 2019)