Add and subtract time durations in hours, minutes and seconds.
Time arithmetic is surprisingly tricky โ adding 1 hour 45 minutes to 2 hours 30 minutes isn't as straightforward as adding regular numbers because 60 minutes equals 1 hour, not 10. Our Time Calculator handles all of this automatically, making it easy to add or subtract time durations, convert between time units, and calculate elapsed time between two moments.
It's the tool for video editors tracking clip lengths, project managers summing task durations, educators timing activities, and anyone who needs to work with hours and minutes accurately.
Choose your operation: add/subtract time durations, or calculate elapsed time between two specific timestamps. Enter your values in hours, minutes, and seconds. The calculator performs the arithmetic with proper borrowing and carrying across time units and displays the result in multiple formats.
Time addition: Convert everything to seconds, add, convert back
Result Seconds = Total Seconds mod 60
Video editing scenario:
Clip 1: 0h 12m 43s
Clip 2: 0h 07m 28s
Clip 3: 0h 22m 05s
Intro/outro: 0h 02m 30s
Total = 12m43s + 7m28s + 22m05s + 2m30s
Converting to seconds:
Clip 1: 763s
Clip 2: 448s
Clip 3: 1,325s
Intro: 150s
Total: 2,686 seconds
Total runtime: 44 minutes and 46 seconds
This exactly matches YouTube's expected video length for a 45-minute educational video โ making time calculation critical for content creators planning upload segments.