➕ Add Time Calculator
Enter two time durations to add them together and get the combined total in hours, minutes, and seconds.
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h
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min
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sec
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h
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min
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sec
What this calculator does
The Add Time Calculator adds two durations together, each entered as hours, minutes, and seconds, and gives you the combined total in a clean hh:mm:ss format.
How the calculation works
Both durations are first converted entirely into seconds, added together, and then converted back into hours, minutes, and seconds, carrying over automatically whenever minutes or seconds reach 60. This avoids the common mistake of adding hours, minutes, and seconds separately without carrying the remainder.
This tool is useful for everyday tasks like adding up work shifts, cooking or workout timers, or combining video and audio clip lengths.
Last reviewed August 2026