Stopwatch
A precise stopwatch with lap timing — start, stop, reset and record laps with split and cumulative times.
About the stopwatch
A precise stopwatch with lap timing — start, stop and reset, and record laps with split times. The display updates to hundredths of a second, and laps are listed with both the lap time and the cumulative total.
It runs entirely in your browser; nothing is stored online.
Tracks elapsed time to hundredths of a second.
Record laps with individual and cumulative times.
Full control with a clear, large display.
Runs in your browser with no account needed.
Frequently asked questions
How accurate is the stopwatch?
It uses the browser's high-resolution timer and displays hundredths of a second. Accuracy is more than enough for everyday timing, though it isn't a certified instrument.
What does the lap button do?
It records the current split — the time since the previous lap — while the stopwatch keeps running, and also shows the cumulative total.
Does it keep running in a background tab?
Timing is based on real timestamps, so the elapsed time stays correct even if the tab is backgrounded; the visible display updates when the tab is active.
Is anything uploaded?
No. The stopwatch runs entirely in your browser.