Stopwatch
A precise stopwatch with laps — press Space to start and stop.
00:00
Keyboard: Space start/stop · L lap · R reset
| Lap | Lap time | Total |
|---|
● Everything is calculated in your browser. Nothing is sent anywhere.
How it works
The stopwatch measures with performance.now(), a high-resolution clock that isn't affected by changes to the system time, and it keeps running even if you switch tabs. A lap records the time since the previous lap; the fastest and slowest laps are highlighted.