Time Calculator
Add two durations together or subtract one from the other, in hours, minutes and seconds. The answer comes back in clock format and also as decimal hours — the form timesheets and invoices usually want, where 2 hours 45 minutes has to be entered as 2.75 rather than 2.45.
Total time
4:15:00
- In hours
- 4.25
- In minutes
- 255
- In seconds
- 15,300
- Written out
- 4h 15m 0s
Nothing is uploaded — this tool runs inside your browser, so your files never leave your device.
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Why use this tool
- Add or subtract two durations in hours, minutes and seconds
- Answer in clock format plus decimal hours for timesheets
- Also given in total minutes and total seconds
- Negative results are shown honestly rather than flipped
How it works
- 1Choose whether to add or subtract.
- 2Enter both durations in hours, minutes and seconds.
- 3Use the decimal hours figure for timesheets and invoices.
Time Calculator — frequently asked questions
Divide the minutes by 60. 45 minutes is 0.75 hours, so 2 hours 45 minutes is 2.75 — not 2.45. Writing it as 2.45 is the single most common timesheet error, and it undercharges by 18 minutes.
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