How to calculate time duration
Duration = end − start − break
Worked example. Duration: 8 hours.
Example inputs — Start time: 09:00; End time: 17:30; Unpaid break (minutes): 30. Starting values are illustrative.
8 h 0 min
From George Guju, founder of Calculyn · Educational calculator guidance, not professional advice.
How it works
We subtract the start time from the end time (wrapping past midnight if needed) and remove any break.
Assumptions & limitations
- Results are rounded for display.
Formula and assumptions reviewed October 2026 by the Calculyn team. How we build our calculators
Frequently asked questions
Does it handle overnight shifts?
Yes. If the end time is earlier than the start, we assume it's the next day.