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Online Stopwatch

High-precision stopwatch with lap recording, note-taking, and automatic data persistence. Ideal for races, workouts, experiments, and time tracking.

Lap Recording
00:05:23.45
Add Notes
Sprint finish
High Precision
±0.01s

The Bottom Line

This precision stopwatch offers centisecond accuracy (±0.01s) for professional-grade time tracking. Record unlimited lap times with individual notes for detailed performance analysis. The lap recording feature captures split times while maintaining total elapsed time, perfect for interval training, race timing, or scientific experiments. Edit lap notes directly in the table to annotate important moments or milestones. All timing data is automatically saved to your browser's local storage, ensuring your lap history persists between sessions. The high-precision timer uses requestAnimationFrame for smooth, accurate updates at up to 100Hz.

00:00:00.00

Start the stopwatch and press "Lap" to record times

Features

Lap Recording

Record split times and lap durations with a single click

Add Notes

Add custom notes to each lap for better tracking

High Precision

Centisecond accuracy for precise timing measurements

Save Laps

Your lap data is automatically saved to local storage

Perfect For

Running & Races
Swimming Laps
Workout Timing
Experiments
Racing Events
Speed Tests