Time Calculator hh:mm:ss
Time Calculator hh:mm:ss
Enter two durations in hours, minutes, and seconds and choose add or subtract — useful for combining video/audio clip lengths, task durations, or race splits.
Both durations are converted to total seconds internally before the addition or subtraction happens, then the result is reformatted back into readable h:m:s — a more reliable approach than trying to add hours, minutes, and seconds columns separately by hand, where carrying across the 60-second and 60-minute boundaries is an easy place to make an arithmetic slip. If subtracting produces a negative result (the second duration is longer than the first), the calculator shows that clearly with a minus sign rather than wrapping around to a confusing positive number.
- Method: both durations are converted to total seconds, added or subtracted, then reformatted back to h:m:s.
- Example: 2:15:30 + 1:45:20 = 4:00:50 (135930s + 6320s... converted correctly via seconds).
- Negative results: if subtracting produces a negative duration, the result is shown with a minus sign.
How do I add three durations?
Add the first two here, then use the result as one of the inputs in a second calculation.
What if seconds overflow past 59?
The calculator automatically carries seconds into minutes and minutes into hours in the final result.
Time Calculator hh:mm:ss
Enter two durations in hours, minutes, and seconds and choose add or subtract — useful for combining video/audio clip lengths, task durations, or race splits.
Both durations are converted to total seconds internally before the addition or subtraction happens, then the result is reformatted back into readable h:m:s — a more reliable approach than trying to add hours, minutes, and seconds columns separately by hand, where carrying across the 60-second and 60-minute boundaries is an easy place to make an arithmetic slip. If subtracting produces a negative result (the second duration is longer than the first), the calculator shows that clearly with a minus sign rather than wrapping around to a confusing positive number.
- Method: both durations are converted to total seconds, added or subtracted, then reformatted back to h:m:s.
- Example: 2:15:30 + 1:45:20 = 4:00:50 (135930s + 6320s... converted correctly via seconds).
- Negative results: if subtracting produces a negative duration, the result is shown with a minus sign.
How do I add three durations?
Add the first two here, then use the result as one of the inputs in a second calculation.
What if seconds overflow past 59?
The calculator automatically carries seconds into minutes and minutes into hours in the final result.