Stopwatch
Start, stop and record laps to the hundredth of a second. Each lap shows its split and the running total, and you can copy the results when you are done.
🔒 Runs in your browser. Nothing is uploaded.
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Keyboard: Space = start/stop · L = lap · R = reset
| Lap | Lap time | Total |
|---|
How to use
- Press "Start" (or the Space bar) to begin timing.
- Press "Lap" (or L) to record a split without stopping the clock.
- Press "Stop" to pause, then "Resume" to continue or "Reset" (or R) to clear.
- Use "Copy laps" to paste the results into a spreadsheet or message.
Examples
Running and swimming
Record each lap of a track or pool session and spot your fastest one.
Presentations
Time each section of a talk while you rehearse.
Experiments and games
Measure reaction times or how long each round takes.
Frequently asked questions
How accurate is the stopwatch?
It uses your browser's high-resolution timer, so it is accurate to well under 1/100 of a second, and switching tabs does not slow it down.
What do "Lap time" and "Total" mean?
"Lap time" is the time since the previous lap. "Total" is the time since you started. The fastest and slowest laps are highlighted once you have three or more.
Are my times saved?
No. Everything stays in this tab and is cleared when you reset or close it. Copy your laps if you want to keep them.