Online Stopwatch

High precision lap timing

Friday, March 27, 2026

8:06:19PM

Online Stopwatch - Precise Lap Timer with Milliseconds

Educational Insights

Precision Timing for Every Need

Our stopwatch is designed for athletes, coaches, and researchers who require split-second accuracy. Record unlimited laps and review your performance instantly.

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Technical Insights

Elapsed time is tracked using high-resolution performance timers where available to reduce drift.

Lap recording is implemented with immutable snapshots to ensure consistent export and analysis.

Rendering updates are throttled to avoid unnecessary re-renders while maintaining precision.

Frequently Asked Questions

Can I record laps?

Yes. Tap Lap to capture split times while keeping the main timer running.

Is it accurate to milliseconds?

It uses high-resolution timers for sub-millisecond precision, subject to browser performance.

Can I export lap data?

Yes. Export CSV to analyze performance across splits.

Is there a pause function?

Yes. Pause and resume without losing the current elapsed time.

What happens if I refresh the page?

The stopwatch state is currently session-based. Refreshing the page will reset the timer to zero. We recommend not refreshing during an active timing session.

Can I measure multiple laps?

Absolutely. You can record an unlimited number of laps. The lap list scrolls automatically to keep the latest split time in view.