Online Stopwatch
Start, stop, lap, copy, and reset with an accurate time display.
Click Start to begin timing.
Elapsed time
00:00.00
Laps
| # | Lap time | Total time |
|---|---|---|
| No laps yet. | ||
Formula
Tool description
A stopwatch measures elapsed time from when you start until when you stop. Laps help you record split times without stopping the clock.
How to use
- Click Start.
- Use Lap to record split times.
- Click Stop to pause. Reset to clear.
Why it’s useful
- Time workouts and intervals.
- Track study or practice sessions.
- Measure how long a process takes.
Use cases & interpretation
- Intervals: use laps to measure repeats.
- Efficiency: compare times across tasks.
- Training: track improvements over time.
FAQs
It uses
performance.now() for high-resolution timing, and calculates elapsed time from timestamps (not by counting ticks).
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