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Time Calculator
Add or subtract multiple time durations in hours, minutes and seconds. Get decimal hours, total minutes and total seconds instantly.
Add and subtract time durations
Combine multiple hours, minutes and seconds or type a compact expression.
Supported examples: 2h + 30m, 90m - 15m, 1h 20m + 45s.
Results update automatically as you type or edit a duration.
Time math without converting everything first
Use this calculator when you need to add or subtract durations rather than clock times. Enter several rows or type a compact expression. The result is normalized and also shown as decimal hours, total minutes and total seconds.
Examples
| Calculation | Result |
|---|---|
| 2h 30m + 1h 45m | 4h 15m |
| 8h − 45m | 7h 15m |
| 90m + 30m | 2h |
Clock times are different
If you want the elapsed time from 8:45 AM to 5:20 PM, use the Time Duration Calculator instead.
Time calculator FAQ
Can a result be negative?
Yes. If the durations you subtract are larger than the durations you add, the normalized result is negative.
What are decimal hours?
Decimal hours express minutes as a fraction of an hour. For example, 1 hour 30 minutes equals 1.5 hours.