Online Stopwatch
Free online stopwatch with lap timer and centisecond precision.
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Online stopwatch for timing anything
Whether you're timing a workout interval, a presentation, a race, or a cooking task, this online stopwatch gives you precise centisecond timing with lap recording — no app download required.
Lap comparison
Record multiple laps and instantly see which was your fastest and slowest. Perfect for tracking split times in running, swimming, or any interval training.
Frequently asked questions
- How do I use the stopwatch?
- Click Start to begin timing. Click Lap to record a split time while the stopwatch keeps running. Click Stop to pause. Click Reset to clear all laps and restart from zero.
- How accurate is the browser stopwatch?
- The stopwatch uses requestAnimationFrame and performance.now() which give sub-millisecond timing precision. Display updates are throttled to ~60fps (centiseconds shown).
- Which lap is fastest and slowest?
- When 2 or more laps are recorded, the fastest lap is highlighted in green and the slowest in red. Summary cards show both values at the bottom of the lap table.
- Can I time beyond an hour?
- Yes. When the elapsed time exceeds 60 minutes, the display adds an hours column (HH:MM:SS.cs format) automatically.
- Does the stopwatch work offline?
- Yes. The stopwatch runs entirely in your browser using JavaScript — no server calls are made. It works even without an internet connection after the page loads.
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