Time Duration Calculator
Add or subtract lengths of time in hours, minutes and seconds.
Time Duration Calculator
Add or subtract lengths of time in hours, minutes and seconds.
Total
2h 16m 15s
- In seconds: 8,175
Hours are not rolled over into days.
How it works
Enter two durations and choose add or subtract. Minutes and seconds carry over, so 75 minutes becomes 1 hour 15 minutes.
- Hours are not rolled over into days: 30 hours stays 30 hours.
- A result below zero is shown with a minus sign.
Method
total seconds = hours × 3,600 + minutes × 60 + seconds, for each duration
result = first ± second, then split back into hours, minutes and seconds
Worked example: 1h 45m + 2h 30m = 4h 15m 0s.
More examples and edge cases
- Minutes carry over: 75 minutes is 1h 15m 0s
- Hours stay as hours: 20h + 10h = 30h 0m 0s
- 45m 30s + 50m 45s = 1h 36m 15s
- A result below zero keeps its sign: 1h 15m − 2h = -0h 45m 0s, meaning 45 minutes short