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Time Duration Calculator

Add or subtract two durations in hours, minutes, and seconds.

Your numbers

Result

4:15:30

Decimal hours
4.2583
Total minutes
255.5

Results are estimates for planning. Check important figures with a qualified professional.

Quick answer

The Time Duration Calculator shows add up durations in hours, minutes, and seconds. How it works: Convert to seconds, add or subtract, then convert back to h:mm:ss. For example, with first: hours of 2, first: minutes of 45, and first: seconds of 0, the result is 4:15:30.

How to use the Time Duration Calculator

  1. Enter first: hours.
  2. Enter first: minutes.
  3. Enter first: seconds.
  4. Choose operation.
  5. Enter second: hours.
  6. Enter second: minutes.
  7. Read result and the breakdown. Use Share to send the exact numbers, or Print to save a PDF.

How it's calculated

  • Convert to seconds, add or subtract, then convert back to h:mm:ss

Worked example

With first: hours of 2, first: minutes of 45, first: seconds of 0, operation of Add, second: hours of 1, and second: minutes of 30:

Result: 4:15:30. Decimal hours: 4.2583.

Questions people ask

Can the result be negative?

Yes, if you subtract a longer duration from a shorter one.