Stopwatch
Start, stop and record laps in big numbers. Works full screen.
A simple stopwatch that fills your screen
Start, stop and record laps in big, easy-to-read numbers, down to hundredths of a second. Each lap shows its own time and the running total, with your fastest lap in green and slowest in red. Handy for workouts and running, timing speeches or presentations, games, experiments, or anything you want to measure.
Keyboard shortcuts
- Space: start, stop or resume
- L: record a lap
- R: reset
- F: full screen
Counting down instead? Use the countdown timer or a ready-made 5, 10 or 30 minute timer.
Stopwatch FAQ
How accurate is the stopwatch?
It measures time with your browser's high-precision clock and shows hundredths of a second. It keeps counting correctly even if you switch tabs. Your reaction time when pressing the button matters far more than the clock itself.
Are my lap times saved?
No. Laps stay on the page until you reset or close it; nothing is stored or sent anywhere.
Will my screen stay on?
While the stopwatch is running or in full screen, the page asks your device to keep the screen awake, which works in most modern browsers.
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