Stopwatch
Precise stopwatch with laps and hundredths of a second.
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How to use the Stopwatch tool
- Enter your stopwatch in the fields above.
- Adjust any slider or type an exact number — the answer updates as you go.
- Copy the result and close the tab. Nothing you entered was sent anywhere.
About the Stopwatch tool
Start, pause and resume with lap recording. Lap times show both the lap duration and the overall elapsed time.
The stopwatch is monotonic — it measures real elapsed time and will not drift if the tab is briefly busy.
Everything runs locally in your browser: no data is uploaded, no account is needed, and it works offline once the page has loaded.
Embed this tool
Customize and copy an iframe. Linking back helps both sites.