Stopwatch
Online stopwatch with lap times. Track your time with precision down to milliseconds.
How to Use
Start timer
Click Start to begin timing.
Record laps
Click Lap to record intermediate times.
Stop & reset
Stop the timer and reset when finished.
Features
Frequently Asked Questions
The stopwatch is accurate to milliseconds, using your device's high-resolution timer.
Yes, click the Lap button to record intermediate times without stopping the main timer.
A precise digital stopwatch with lap timing functionality for athletic training, scientific experiments, or any activity requiring accurate time measurement. Features include lap times, split timing, and full keyboard control - all running locally with millisecond precision.
Did You Know?
The most accurate stopwatch in the world is an atomic clock that loses only one second every 300 million years! In contrast, mechanical stopwatches from the 19th century were considered highly accurate if they lost less than a second per day. Modern smartphone sensors can now measure time to nanosecond precision.
Pro Tips
- Use keyboard shortcuts for faster control: Space to start/stop, L for lap, R for reset
- Record lap times consistently - press at the same point each cycle for accurate comparisons
- Keep the browser tab active for most accurate timing - background tabs may throttle JavaScript
Common Use Cases
- Timing athletic training intervals and rest periods
- Measuring presentation or speech duration
- Conducting scientific experiments with timed trials
- Tracking cooking times and recipe steps
- Monitoring productivity work sessions (Pomodoro alternative)
Best Practices
- Start timing on a clear action point for consistency
- Record lap times to a spreadsheet for detailed analysis
- Use multiple timings and average for scientific accuracy
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