Stopwatch
Time anything to 1/100 of a second and record laps.
Keyboard: Space to start or stop, L for a lap, R to reset.
Laps
Press Lap while the stopwatch runs to record a lap.
| Lap | Lap time | Total |
|---|
Stopwatch
This stopwatch measures elapsed time to 1/100 of a second. Record laps while it runs to see each lap time and the running total, with the fastest and slowest laps marked.
Time is measured from the browser’s high-resolution clock, so it stays accurate when the page is in the background. The numbers on screen catch up when you come back.
How to use
- Click Start, or press Space.
- Click Lap, or press L, each time you want to mark a lap. Click Stop to pause, and Resume to continue.
- When stopped, click Reset, or press R, to clear the time and laps. Click the copy button to copy the lap table.
Key terms
Lap time and total time
The lap time is the time since the previous lap. The total is the time since the start. In running, the total at each mark is often called a split.
FAQ
Does it keep running in another tab?
Yes. Elapsed time is calculated from the clock, not counted step by step, so switching tabs does not lose time.
Can I paste the laps into a spreadsheet?
Yes. The copy button copies the table with tabs between columns, which pastes into separate cells.
Are my times saved?
No. Nothing is saved or sent to a server. Refreshing the page clears the stopwatch.