A free online stopwatch with lap timer. Record splits for running, cooking, workouts, or any timed activity. Millisecond precision with accurate background timing.
Lap Times
| Lap | Lap Time | Cumulative |
|---|
How to Use the Online Stopwatch
This stopwatch is useful for timing any activity that requires split tracking. Whether you're training for a race, timing a recipe, or measuring work intervals, the lap feature records each segment precisely.
Using Lap Times
Click Start to begin timing, then click Lap at each checkpoint to record a split without stopping the timer. Each lap shows the time for that segment and the total elapsed time. You can export all laps as a text file.
Accuracy
The stopwatch uses high-resolution timestamps from the browser, giving millisecond accuracy. It continues to track correctly even when you switch browser tabs.
FAQ
How accurate is the online stopwatch?
The stopwatch uses the browser's performance.now() API for millisecond-level accuracy. It continues to run accurately even if you switch tabs, though browser throttling may affect very long sessions.
Can I record lap times?
Yes. Click the Lap button while the stopwatch is running to record a split. The lap table shows each lap number, the time for that lap, and the cumulative time.
Can I export my lap times?
Yes. Click Export to download a text file of all lap times for your records.
Does it keep running if I switch tabs?
Yes. The stopwatch uses timestamp-based timing, so it stays accurate even when the tab is not visible. The display updates when you switch back.
Is this stopwatch free?
Yes, completely free with no signup or installation required.