What this tool does
This stopwatch provides precise timing with millisecond accuracy directly in your browser. Record individual lap or split times while the clock keeps running, then review or copy your results. No app installation required — it works on any device with a web browser.
How it works
The stopwatch uses your device's high-resolution timer (\`performance.now()\`) combined with \`requestAnimationFrame\` for smooth, drift-free display updates at up to 60 frames per second.
**Lap timing** records the interval between each lap press while tracking the cumulative total. The display shows centisecond precision (1/100th of a second) for readability, while internal calculations maintain full millisecond accuracy.
Who should use this
- **Athletes and coaches**: Track interval training, sprint times, and recovery periods - **Students**: Time study sessions using the Pomodoro technique or timed practice tests - **Cooks**: Keep precise timing for recipes that require exact durations - **Presenters**: Monitor speech and presentation segment lengths - **Anyone timing tasks**: Measure how long everyday activities take
How to use
1. Press **Start** to begin the stopwatch 2. Press **Lap** while running to record a split time without stopping the clock 3. Press **Stop** to pause the timer — press Start again to resume 4. Press **Reset** to clear everything and start over 5. Use **Copy All Laps** to export your lap data as text
Tips
- The timer continues running in the background if you switch browser tabs - Lap times show both the individual lap duration and the cumulative total - The fastest and slowest laps are highlighted in the statistics summary - You can copy all lap data to paste into spreadsheets or notes
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