Time Duration Calculator
Calculate the exact duration in hours and minutes between two dates and times with this free time duration calculator online.
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Result
Enter the details to see your result.
Runs in your browser. Your inputs are not saved or transmitted.
How to use this calculator
- Enter a start date & time and an end date & time.
- Optionally subtract a break in minutes.
- Read the duration in h:m:s and decimal hours.
How it works
Duration = end − start, minus any break. Decimal hours = seconds ÷ 3600 — handy for timesheets and pay.
Worked example
9:00 to 17:30 with a 30-min break. = 8h 0m (8.00 decimal hours).
Tips
- Runs entirely in your browser. Your inputs are not saved or transmitted.
Frequently asked questions
Is it good for timesheets?
Yes — the decimal-hours output is exactly what most payroll systems expect.
Privacy?
Runs entirely in your browser. Your inputs are not saved or transmitted.
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Explore more in Time, Date, Roster & FIFO.
Cite this tool
Zerdly. (2026). Time Duration Calculator. Retrieved from https://www.zerdly.com/tools/time-duration-calculator/
Tip: Enter any known values to calculate the remaining results.
All calculations run in your browser. Your inputs are never saved or transmitted.