Online Stopwatch with Lap Times

Online stopwatch

A clean, accurate stopwatch that works on any phone or computer. Start and stop with one tap, record as many lap times as you like, and see each lap's time alongside the running total — with your fastest and slowest laps highlighted. It's handy for running and swimming practice, timing speeches and presentations, school science experiments, cooking, or seeing how fast you can solve a puzzle.

How to use it

Tap Start (or press Space).
Tap Lap (or press L) at the end of each lap.
Stop, then copy your laps or Reset.

Example

Timing 4 laps of a 400 m track: laps of 1:52, 1:58, 2:03 and 1:49 give a total of 7:42 for 1.6 km — and the highlighted fastest lap shows you finished strongly. Turn that into a pace per km with therunning pace calculator, or count down instead with thecountdown timer.

Frequently asked questions

How accurate is this stopwatch?

It reads your device’s high-resolution clock, so the time itself is accurate to well under a hundredth of a second. Your reaction time when tapping the button (typically 0.15–0.3 s) is a much bigger source of error.

Does it keep running in the background?

Yes. The time is calculated from when you pressed Start, so switching apps or tabs doesn’t affect it. Keep the page open — closing it resets the stopwatch.

What is the difference between lap and split time?

The lap time is how long that lap took on its own. The split (total) time is the overall time when the lap was recorded. The fastest and slowest laps are highlighted.

Are there keyboard shortcuts?

Yes: Space starts and stops, L records a lap, and R resets (when stopped).