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.
Step by step
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.
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.
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.
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 HoursA standard shift with a quarter hour, the classic payroll example.
8h 45m=8.75 HoursThree quarters of an hour converts to a clean .75 decimal.
8h 20m=8.3333333 HoursAn odd minute count gives a repeating decimal that payroll rounds to 8.33.
8h 15m=495 MinutesSame shift shown as total minutes if your system wants minutes instead.
Try it yourself
Type hours, minutes, days, weeks, months, years, or seconds, as full words or shorthand (h m d w), with + - * /. Pick how the answer reads with Show result as up top. It all runs in your browser. Drag the card’s right edge to make it wider.
Common 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.
For a payroll clerk who has to enter each employee's daily hours as a decimal into the wage system.