Add up a stretch of work
Change any number and the result updates as you type.
3h 30m
Duration
3.50
Decimal hrs
210
Minutes
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How to use the time duration calculator
- Enter the time you started.
- Enter the time you stopped. If it’s earlier than the start, the calculator counts through midnight.
- Add any break in minutes, like lunch.
- Copy the decimal hours onto your timesheet or invoice.
How the time duration calculator works
The calculator counts the minutes from start to end, adds a day if the end is earlier than the start, and takes off the break. Then it shows the result three ways.
Minutes workedend − start − break
Decimal hoursminutes worked ÷ 60
Decimal hours are what invoices and spreadsheets expect: 3 hours 30 minutes is 3.5, not 3.30. Mixing the two up quietly undercharges, because 3.30 hours is only 3 hours and 18 minutes.
- End − start
- 12:45 − 9:15
- Break
- 0 minutes
- Minutes worked
- 210
- Duration
- 3h 30m = 3.50 hours
At $120 an hour that’s $420. Billed as 3.30 hours by mistake, it would be $396.
Time duration calculator FAQ
How do I turn hours and minutes into decimal hours?
Divide the minutes by 60 and add them to the hours: 2 hours 45 minutes is 2 + 45 ÷ 60 = 2.75. Six minutes is 0.1 of an hour, which is why many freelancers bill in six-minute steps.
Does it work past midnight?
Yes. If the end time is earlier than the start, it counts through midnight, so 10pm to 1am is 3 hours. It handles one stretch of up to 24 hours at a time.
Should I bill my breaks?
No. Take lunch and other breaks off before you bill. If you took several short ones, add them together and enter the total as one break.
Should I round my time?
Many freelancers round each entry to 6 or 15 minutes. Whichever you choose, round the same way every time and say so in your contract, so the client knows how they are billed.
How do I add up a whole week?
Work out each stretch here, then total the decimal hours. The billable hours calculator adds a week of entries at your rate and shows what to invoice.
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