Time calculator guides
Short, practical walk-throughs for the most common time-math jobs. Every guide leads with a direct answer, then shows worked examples you can run right here in the browser.
How do I add up hours and minutes?
Add up hours and minutes in one line. Type each duration like 8h 15m, join them with +, and pick a format. Free time calculator for timesheets, web and apps.
Read the guide →Guide 02How do you calculate hours worked between two times?
Calculate hours worked between two clock times. Write each time as hours and minutes from midnight, then subtract: 17h 45m - 9h 15m gives 8 Hours 30 Minutes.
Read the guide →Guide 03How do I add and subtract time durations across units?
Add and subtract time across hours, minutes, days, and weeks in one line. Type "2 days - 4h" and read the result in any format. Free, no conversion needed.
Read the guide →Guide 04How do I total the hours on a weekly timesheet?
Add up your weekly timesheet or time card hours in seconds. Type each day as hours and minutes, hit plus, and get a clean Hour Minute total. Free, in your browser.
Read the guide →Guide 05How do I multiply or split a time duration?
Multiply or split a time duration in seconds. Type "8h 15m × 3" to repeat a block or "1 day ÷ 4" to divide it evenly. Free, right in your browser.
Read the guide →Guide 06How do I convert between time units like minutes to seconds or hours to minutes?
Convert minutes to seconds, hours to minutes, seconds to hours, and milliseconds with a free time calculator. Type the duration, pick an output format, done.
Read the guide →Guide 07Convert Time to Decimal Hours
Convert hours and minutes to decimal hours for payroll. See why 8h 15m = 8.25, the 15/30/45 rule, and how to handle repeating decimals like 8.3333333.
Read the guide →Guide 08How to Calculate the Time Between Two Times
Find the time between two times by writing each clock time as a duration from midnight, then subtracting. Examples for parking, ovens, study blocks, and flights.
Read the guide →Guide 09Add Up Video and Audio Lengths (mm:ss and Milliseconds)
Total clip and track lengths in minutes and seconds, roll past an hour, and work in milliseconds. A free mm:ss calculator built for video editors and audio work.
Read the guide →Guide 10Billable Hours Calculator
Add up billable time across client sessions and convert the total to decimal hours for invoicing. Sum durations, multiply repeated tasks, and get a clean decimal.
Read the guide →Guide 11How do I use a time card calculator to total payable hours?
Free time card calculator: turn clock-in and clock-out punches into payable hours. Subtract 30m breaks, total the week, and convert to decimal for payroll.
Read the guide →Guide 12Work Hours Calculator: How Many Hours Did I Work?
Free work hours calculator: type each shift like 8h 15m + 7h 45m + 8h, subtract breaks, and read the total as hours and minutes or decimal hours for payroll.
Read the guide →Guide 13Overtime Calculator: Hours Over the 40-Hour Week
Free overtime calculator: subtract the 40-hour week from your total, like 43h 45m - 40h = 3 Hours 45 Minutes, then read it as decimal hours for 1.5x pay.
Read the guide →Guide 14How do I subtract lunch break from work hours?
Subtract lunch break from work hours in one line: 9h - 45m gives 8 Hours 15 Minutes. Chain minus signs to deduct every unpaid break and total the week.
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