Count down a set time or to a date and time, with a large full-screen display and alarm.
Stopwatch
Time an activity to a hundredth of a second, capture laps and export them as CSV.
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Ready
Keyboard: Space start/pause, L lap, R reset. Shortcuts do not run while you are typing.
Laps
| Lap | Lap time | Total |
|---|
Timing follows your device clock and is stored only in this browser. It is useful for everyday timing, not official sports or exam timing.
Runs entirely in your browser. Your files and text are not uploaded.
How to use Stopwatch
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Step 1: Start timing
Press Start or Space. The display continues accurately from your device clock.
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Step 2: Capture laps
Press Lap or L during a run to add lap and total times to the table.
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Step 3: Save results
Pause, reset, enter full screen or download the lap table as CSV when you need it.
A browser stopwatch with laps
Start the stopwatch to measure an activity, then add laps to keep individual intervals and the total elapsed time. The display uses the device clock rather than adding a little time for every redraw, so it catches up after a busy or backgrounded tab can render again.
Space starts or pauses, L records a lap and R resets. These shortcuts do not run when a form field has focus.
Keep your results on this device
The stopwatch state and laps are saved in this browser so a reload can restore a running or paused timer. Export the laps as CSV when you want to keep or analyse them elsewhere. No timing data is uploaded to a server.
Browser timing and your reaction time are not suitable for official sports, safety timing or exam timing.
Limitations
- Backgrounded, sleeping or closed browser tabs can delay visible updates.
- Device-clock timing and reaction time are not suitable for official sports or safety-critical timing.
- State is kept only in this browser on this device and can be cleared with browser data.
Frequently asked questions
Does the stopwatch keep running after a reload?
It stores its start time and accumulated time in this browser, so a reload on the same device can restore it.
What are lap and total time?
Lap time is the interval since the previous lap. Total time is the elapsed time since you started.
Can I save the laps?
Yes. Press CSV to download the lap and total times in a spreadsheet-friendly file.
Related tools
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Add or subtract hours, minutes and seconds. Find the difference between two times or add a duration to a start time.