How accurate is this stopwatch?

It uses the browser's high-resolution performance.now() timer, which provides microsecond-level resolution. The display is rounded to centiseconds (1/100 second).

What's the difference between split and total time?

Split is the time elapsed since your previous lap. Total is the elapsed time since you started the stopwatch.

Can I record laps while paused?

No — the stopwatch must be running to record a lap. Resume first, then capture your lap.

How are fastest and slowest laps identified?

After you record at least two laps, the tool highlights the one with the shortest split as Fastest and the longest as Slowest.

Does it keep running if I switch tabs?

Yes — performance.now() measures real elapsed time, so the display catches up correctly when you return. The animation may pause while hidden, but the time stays accurate.

Stopwatch

Accurate stopwatch with laps — centisecond precision, no uploads.

100% private — no uploads Date & Time ToolsFree & unlimited Read tutorial

See how it works

Watch a quick simulation of this tool in action — no file needed.

How to use Stopwatch

Follow these steps — everything happens instantly in your browser.

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Step 1. Click Start to begin timing — the display shows mm:ss.cs (centiseconds).
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Step 2. Click Lap while running to record a split. Each lap shows the split time and cumulative total.
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Step 3. Click Pause to halt, then Resume to continue without losing elapsed time.
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Step 4. Click Reset to clear the timer and all laps. Fastest and slowest laps are tagged automatically.