Does the stopwatch work in the background?

Yes. The stopwatch uses your system clock for timing, so it remains accurate even if you switch to another tab or minimise the browser.

Can I record lap times?

Yes. Click the Lap button while the stopwatch is running to record split times. All laps are displayed in a list.

How accurate is this online stopwatch?

The stopwatch is accurate to the millisecond using your browser's high-resolution timer (performance.now). Human reaction time in pressing start/stop introduces about 200-300ms variance.

Free Online Stopwatch — Lap Times & Millisecond Precision

Precise stopwatch with lap tracking

00:00:00.00

Laps

0 laps

No laps recorded

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About the Online Stopwatch

A precise online stopwatch with lap timing, split times, and millisecond accuracy. Use it for timing workouts, cooking, presentations, speed tests, or any activity that needs accurate timing. Works in your browser — no app download needed.

Features start/stop/reset, lap recording, and continues timing even if you switch browser tabs.