Stopwatch & Countdown Timer
Precision stopwatch with laps plus a countdown timer with alarm.
Stopwatch
Laps
No laps yet. Start the stopwatch and press Lap to record split times.
About the Stopwatch & Countdown Timer
A millisecond-accurate online stopwatch with lap and split times, and a countdown timer that plays an alarm sound when it finishes. Timing uses requestAnimationFrame so it stays accurate even when the tab is throttled.
Examples
Lap timing
Start, tap Lap three timesOutput
Lap and split table with millisecond precisionKeyboard shortcuts
- Copy the main outputCtrl / ⌘ + Shift + C
- Download the resultCtrl / ⌘ + S
- Share this toolCtrl / ⌘ + Shift + S
- Reset the inputsAlt + R
- Open the tool search paletteCtrl / ⌘ + K
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Frequently asked questions
Version 1.0.0 · Updated 2026-08-14 · Runs entirely in your browser