Online Stopwatch
Start, lap, copy, and export. Centisecond display, fullscreen-ready and ad-free.
Ready.
| # | Split | Total |
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About this stopwatch
This is a clean, fast stopwatch for timing anything from a sprint to a presentation. Hit Start to begin, Lap to mark splits, and Stop to pause. The elapsed time is computed from the real system clock — not accumulated tick counts — so it catches up cleanly when the page updates after tab switches or browser pauses. Use fullscreen for a big classroom display, and copy or export your laps for further analysis in a spreadsheet.
Common uses
- Athletics and fitness — track intervals, splits and personal bests.
- Cooking — time multiple stages without resetting between them.
- Presentations and debates — keep speakers to their allotted time.
- Development and testing — measure how long a build or process takes.
- Games — any activity that needs a running clock with recorded splits.
Questions
- Does it keep timing if I switch tabs?
- Yes. The stopwatch is built on absolute epoch time (Date.now()), so switching tabs or returning after a browser pause does not add tick-count drift. The elapsed time is recalculated from the real clock when the page updates.
- How do I record a lap?
- Click the Lap button while the stopwatch is running, or press the L key. Each lap entry shows the split (time since the last lap) and the running total. The most recent lap is highlighted at the top of the list.
- Can I save my lap times?
- Yes. Click "CSV" after recording at least one lap to download stopwatch-laps.csv, or click "Copy" to place the lap/split table on your clipboard.