Online Stopwatch with Laps
An accurate online stopwatch with lap times, split differences, keyboard control and CSV export of your laps. Works offline once loaded.
Runs on your device
What it does
Start, record laps and stop with the mouse or keyboard. Each lap shows its own time and the running total, and you can export the list for a spreadsheet.
How to use it
- Press Start or the space bar.
- Press Lap (or L) to record split times.
- Stop, then copy or download the laps.
When it helps
- Timing runs and swimming laps.
- Measuring how long tasks take.
- Lab experiments that need repeated timings.
Questions
How precise is it?
It reads the browser’s high resolution clock and displays hundredths of a second. Human reaction time is the main source of error.
Does it keep running if I switch tabs?
Yes. Time is calculated from start and stop moments, not counted tick by tick.
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