Browser-onlyLiveGeneral Calculators
Time Calculator
Add or subtract two times in hours, minutes, and seconds.
Privacy note. Runs in your browser. The hours, minutes, and seconds you enter never leave this page.
Result (HH:MM:SS)04:15:15
Hours4
Minutes15
Seconds15
Total seconds15,315
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Frequently asked questions
Yes. The result is not wrapped to a 24-hour clock — if the sum is 30 hours, you will see 30:00:00 and 108,000 total seconds.
You will see the absolute difference prefixed with a minus sign, plus a negative total-seconds value. Switch the order of inputs to flip the sign back to positive.
After adding or subtracting, the calculator converts the absolute total seconds into whole hours, the remaining whole minutes, and the leftover seconds — so 90 added seconds become 1 minute and 30 seconds.
Last updated 2026-06-03.