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Online Stopwatch — Lap Timer with Millisecond Precision
A simple, precise stopwatch running in your browser. Start, pause, resume, and record lap/split times. Measures down to milliseconds.
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How It Works
Uses requestAnimationFrame for smooth display updates and performance.now() for precise timing. Lap recording captures both individual lap time and cumulative split time.
Common Use Cases
- Time study sessions or work intervals
- Track workout and exercise intervals
- Measure task completion times
- Record lap times for running or swimming
Frequently Asked Questions
It uses the browser's high-resolution timer (performance.now) which provides sub-millisecond precision.
The timer continues running when the tab is in the background, though the display updates when you return.