Time Calculator

Add or subtract hours, minutes, and seconds easily.

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Time Calculator

Time Calculator: Add and Subtract Time

A time calculator adds or subtracts hours, minutes, and seconds to find elapsed time, total duration, or end time. It handles 12-hour (AM/PM) and 24-hour (military) formats and automatically carries over seconds to minutes and minutes to hours.

Common Uses

  • Adding up work hours for weekly totals
  • Calculating total duration of a playlist or event
  • Finding end time given start time and duration
  • Converting between time formats

Frequently Asked Questions

How do I add up time in hours and minutes?
Convert everything to minutes, add, then convert back. Example: 2h 45m + 1h 30m = 165min + 90min = 255min = 4h 15min. Alternatively: add hours (3h), add minutes (75min = 1h 15min), combine for 4h 15min.
What is military time and how do I convert it?
Military (24-hour) time eliminates AM/PM confusion. For times from 1 PM onward, add 12 to the hour: 3 PM = 1500, 6:30 PM = 1830. For midnight = 0000, noon = 1200. To convert back: subtract 12 from hours 13–23.
Is this calculator free to use?
Yes. All calculators on zenicalculator.com are completely free with no registration required.
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