How to use the time duration calculator
- Start time: Choose the starting time, using the same local time zone.
- End time: Choose the finishing time. An earlier time is treated as the next day.
- Unpaid break (minutes): Minutes to subtract from the elapsed duration.
- Select Calculate to see the result. Change any input and calculate again to compare.
Worked example
09:00 to 17:30 minus 30 minutes is 8 hours.
Formula and assumptions
Finish − start − break = duration.
Assumes at most 24 hours, with identical start/end meaning zero. Does not account for daylight-saving transitions.
Common questions
Why might my result differ from another estimate?
Assumes at most 24 hours, with identical start/end meaning zero. Does not account for daylight-saving transitions. Keep the same inputs and rounding when comparing tools.
Are my entries saved?
No. Calculations run on your device. Reloading or closing this page may clear your entries.