Precision stopwatch with lap times.
Millisecond-precision stopwatch running in your browser with start, pause, lap, and reset.
No login, no ads-in-the-way — just click and time.
Lap timing works by recording a snapshot of the running total at each click, rather than restarting the clock, so your cumulative time keeps running accurately across every lap.
Click Start; the display counts up. Lap records split times; Reset zeroes it out.
Uses performance.now() for sub-millisecond precision. Real accuracy is limited by browser scheduling — a few ms on a busy page is normal.
Yes — the clock keeps ticking. Browsers can throttle background tabs, but final elapsed time is calculated correctly.
For casual and practice use, yes — but for anything requiring certified precision (official race timing, for example), dedicated hardware timing systems remain the standard.