Time Duration Calculator

Time between two clock times, or add/subtract time.

Instant · runs in your browser
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About the Time Duration Calculator

Calculate how long it is between two times, such as a work shift, a journey or a lecture, including periods that pass midnight. You can also add or subtract hours and minutes from a time.

Examples

  • 9:15 AM to 5:45 PM = 8 h 30 min
  • 10:00 PM to 6:30 AM = 8 h 30 min
  • 2:40 PM + 3 h 35 min = 6:15 PM

Great for timesheets, overtime and planning.

How to use Time Duration Calculator

  1. Enter your values. Units and defaults are shown beside each field.
  2. Press Calculate (results also update as you type once calculated).
  3. Read the result and the step-by-step breakdown with the formula used.
  4. Copy the result or reset to start again.

Frequently asked questions

How accurate is this calculator?

Calculations use the standard formulas shown on the page, computed in full precision and rounded only for display. The result is only as accurate as the inputs and assumptions listed.

Is it free?

Yes. All tools are free to use without an account.