Time Calculator

Add or subtract time values, or add a duration to a starting time of day. Handles carry-over like 90 minutes → 1 hour 30 minutes.

All calculations happen in your browser.

How to use Time Calculator

  1. Choose “Add or subtract durations” or “Time of day + duration”.
  2. Enter the hours, minutes and seconds.
  3. The result updates instantly, normalised to days, hours, minutes and seconds.

About this tool

Adding times by hand means carrying 60 minutes into hours and 24 hours into days. This calculator does that automatically, and can also answer “what time will it be in 7 hours 45 minutes?”.

Frequently asked questions

Can I enter more than 60 minutes?
Yes. Values are normalised automatically, so 90 minutes is shown as 1 hour 30 minutes.

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