Stopwatch

Free online stopwatch with lap times, split tracking, and millisecond precision. No download, runs in your browser.

Runs entirely in your browser — files never uploaded

00:00:00.00

How to use Stopwatch

1. Start the stopwatch. Click Start to begin timing. The display updates in real time with hours, minutes, seconds, and centiseconds.
2. Record laps. Press Lap while running to record split times. Best and worst laps are highlighted in the list.
3. Stop and reset. Stop the timer to pause, resume to continue, or reset to start fresh.

How accurate is this stopwatch?

It uses the browser's high-resolution timer (Date.now) with a 10ms refresh interval, giving centisecond-level precision.

Can I record lap times?

Yes. Press the Lap button while the stopwatch is running to record each split. Laps show both individual and cumulative times.

Does it keep running if I switch tabs?

Yes. The elapsed time is calculated from the actual system clock, so switching tabs does not affect accuracy.