Hours to Decimal Calculator

What are decimal hours?

A clock time such as 8:30 means eight hours and thirty minutes. Payroll, billing, and a lot of scheduling software do not store the colon. They store decimal hours: 8.50. The minutes become a fraction of an hour, and the fraction is what gets multiplied by an hourly rate.

That is why this hours to decimal calculator is built for a timesheet, not for a kitchen timer. You can start from hours and minutes, from a decimal, or from a pasted token. The same page also carries a minute chart, because people often land here just to check that 15 minutes is 0.25 and not 0.15.

How to convert hours and minutes to decimal

Divide the minutes by 60, then add the hours. The line under the form is the whole rule: decimal = hours + minutes / 60.

• 8 hours 30 minutes: 30 / 60 = 0.50, so the decimal is 8.50.
• 8 hours 15 minutes: 15 / 60 = 0.25, so the decimal is 8.25.
• 7 hours 45 minutes: 45 / 60 = 0.75, so the decimal is 7.75.
• 0 hours 6 minutes: 6 / 60 = 0.10, one tenth of an hour.

Two decimal places is the default because that is how many payroll screens print the number. The value underneath can be longer. One minute is 1/60 of an hour, about 0.0167, which rounds to 0.02 if you only keep two places. The chart below shows both columns so you can see the rounding instead of discovering it on a paycheck.

How to convert decimal hours back to hours and minutes

Keep the whole number. That is the hours. Multiply whatever is left by 60 and round to the nearest minute. 8.75 leaves 0.75, and 0.75 × 60 is 45, so you get 8 hours 45 minutes, or 8:45 on a clock.

If the leftover fraction rounds to 60 minutes, those minutes become the next hour and the minute display goes back to 0. That boundary is rare in typed times, and it is described with the other formulas on the assumptions and formulas page. When you type a decimal that is not an exact minute, the hours and minutes shown here are the nearest clock time, and a short note says so.

Minutes-to-decimal quick reference

The chips above the converter are the four lookups people repeat all week: 15 minutes is 0.25, 30 is 0.50, 45 is 0.75, and 6 minutes is 0.10. The full 0-to-59 table is the next section. If you only have a pile of minutes, the minutes to decimal hours page starts from that single number and also accepts totals past 59, such as 90 minutes = 1.50.

Why timesheets use tenths and hundredths

Some job sites still round to the tenth of an hour. Six minutes is the tenth, twelve minutes is two tenths, and so on. Hundredths are the two-decimal numbers: 0.25 for a quarter hour, 0.01 for a bit less than a minute. Neither system is “more official.” They are display choices. What matters is that you do not round every small slice and then add the rounded slices if you can avoid it.

Add the exact minutes, or the unrounded decimals, and round the total once. The batch box does that. It converts each line, sums the exact decimals, and only then applies the decimal places you picked. Rounding 0.02 ten times and adding those pennies of an hour is how a week drifts by a few minutes.

Common mistakes

The classic slip is typing 8.30 when the timesheet says 8:30. Those are different. 8:30 is 8.50 decimal hours. 8.30 decimal hours is 8 hours and 18 minutes, because 0.30 × 60 = 18. A rate of $20 then prices the wrong length of shift: 8.50 hours is $170, while 8.30 hours is $166.

Another slip is treating 7.5 hours as 7 hours and 5 minutes. The “.5” is half an hour, so 7.5 is 7 hours 30 minutes. Five minutes would be about 0.08 hours, not 0.5.

Decimal hours are also what the pay tools on this site expect. After the time is converted, the overtime calculator splits a workweek at 40 hours. The time and a half calculator prices hours that are already overtime. The pay raise calculator turns a percent into a new hourly or annual amount. The salary to hourly calculator divides a yearly salary by the hours in the year, using 40 × 52 unless you change it. A seven-day card belongs on the weekly overtime calculator.