Time Duration Calculator
Add or subtract hours and minutes between times.
Duration
8h 0m
- Decimal hours
- 8 h
- Total minutes
- 480 min
- Before the break
- 8h 30m
How this is calculated
duration = end − start (+24h if overnight) − break
09:15 → 17:45 = 8h 30m
− 30m break = 8h 0m
Computed on your device — nothing is sent anywhere.
How it works
Add or subtract hours and minutes between times. Runs 100% in your browser, so your files never leave your device. Free, fast, no signup.
Questions about time duration calculator
Yes — no watermark, no daily cap, no signup. Pro raises the file-size and batch limits, but the tool itself is not gated.
No. This tool runs entirely in your browser. Open your network inspector and watch while it works — there are no file uploads, because there is no upload endpoint.
Up to 10 files at 15 MB each. Everything runs in your browser, so the real ceiling is your device’s memory — the cap keeps a large file from exhausting the tab.