Looking for a add and subtract time hours minutes seconds calculator? This free tool gives you add or subtract durations in hours, minutes and seconds. Just enter your numbers and press Calculate — results are instant.
Adding or subtracting durations is awkward by hand because minutes and seconds roll over at 60, not 100. This calculator converts both durations to seconds, adds or subtracts them, and converts the answer back to hours, minutes and seconds. Use it for adding up work sessions, race splits, video lengths or any two time spans.
Example: 2 hours 30 minutes 0 seconds + 1 hour 15 minutes 30 seconds
Result: 3h 45m 30s
Yes. The result is shown with a minus sign — for example, 1 hour minus 2 hours is −1 hour. The total seconds and minutes are shown the same way.
They roll over automatically: 45 seconds plus 30 seconds is 1 minute 15 seconds, not 75 seconds. The calculator handles the carrying for you.
Adding up work sessions, race splits, video or audio lengths, cooking times — any time two durations need combining.