Stopwatch
Time anything with millisecond precision and lap splits
Laps
| # | Split | Total |
|---|---|---|
Fastest lap
Slowest lap
About the Stopwatch
A precise, simple stopwatch with lap timing. Click Lap while running to record a split — the table shows each lap's individual time and the cumulative total. The fastest and slowest laps are highlighted automatically.
Timing uses the browser's high-resolution timer (performance.now), accurate to roughly a millisecond. Pausing and resuming preserves the elapsed time precisely.
Frequently asked questions
Does the timer keep running if I switch tabs?
Yes — elapsed time is calculated from absolute timestamps, so it's correct even if the tab is in the background and the display freezes. Switching back snaps to the right time.
How precise is it?
Sub-millisecond on modern browsers — limited mostly by reaction time on the start/stop buttons. Display updates at ~60 fps.