Stopwatch
A precise stopwatch with lap timing — start, stop, reset and record laps with split and cumulative times.
About the stopwatch
Updated June 2026 · 100% client-side — your data never leaves your browser.
A precise online stopwatch with lap timing — start, stop and reset, and record laps with split times whenever you need them. The display updates to hundredths of a second, and each lap is listed with both its individual split and the running cumulative total, so it's well suited to workouts, cooking, speed runs and timing tasks.
Timing is based on real timestamps rather than a ticking counter, so the elapsed time stays accurate even if the browser tab is backgrounded. It runs entirely in your browser with no account or install — nothing is stored online.
See also: Pomodoro timer
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.