About the Stopwatch
A precise, distraction-free stopwatch with centisecond accuracy, lap recording (with fastest/slowest highlighting), keyboard shortcuts (space to start/stop, L for lap) and a large readable display.
Runs on high-precision performance timers, so it stays accurate even during long sessions.
How to use the Stopwatch
- Press Start (or spacebar) to begin timing.
- Press "Lap" (or L) to record splits.
- Press Stop, review laps, then Reset.
Common uses
Timing workouts and intervals
Sports practice and racing
Cooking, presentations and experiments
Frequently asked questions
How accurate is it?
It uses performance.now(), a monotonic sub-millisecond clock, displayed to centiseconds.
Do laps show which was fastest?
Yes — the fastest and slowest laps are highlighted automatically.
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