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Duration Calculator

Total seconds = hours × 3600 + minutes × 60 + seconds.

Your inputs stay in your browser. No account required.
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How Duration Calculator works

Total seconds = hours × 3600 + minutes × 60 + seconds.

Try an example

2 hours 30 minutes → 9,000 seconds.

Good to know

This is elapsed duration arithmetic, independent of timezone. Fractional inputs are allowed.

Your privacy

Processing happens on this device for this tool. We do not upload your input, put it in share links or save it to your favourites. Closing this tab discards the working input; downloaded results remain wherever you save them.

When this tool is useful

Use Duration Calculator when you need a quick, local result and want the rule or limitation visible alongside it.

How to use it

  1. Enter the input using the labels shown.
  2. Run the operation and review the result.
  3. Download or copy the result only after checking it.

Checks before you rely on the result

  • This is elapsed duration arithmetic, independent of timezone. Fractional inputs are allowed.
  • Keep the original input when the operation creates a new copy.
  • Use the related tools below when the next step needs a different format.

This page is maintained with the tool implementation and its deterministic tests. If the result looks wrong, report the issue with a non-sensitive example.

Read the Duration Calculator instructions

A useful next step

Date Difference
Add / Subtract Days
Business Days Calculator
Made for clarity. Built to be useful.Report an issue