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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.
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.