An accurate stopwatch in a browser tab
Elapsed time is the difference between two wall-clock readings, not a sum of animation frames. That distinction matters more than it sounds: a frame-counted stopwatch drifts whenever the browser drops frames, and it can lose several seconds over a few minutes on a busy machine.
Hundredths of a second are shown by default. Turn them off and the digits get considerably larger, which is the better choice on a screen people are watching from a distance.
- Timing an activity, a drill or a demonstration
- Lap timing where you need splits as well as totals
- A visible clock on a shared screen during a timed exercise
Lap times and splits
Each lap records both the split — the time since the previous lap — and the total elapsed. The six most recent laps stay on screen, newest first, which is as many as fit legibly at a size you can read from a distance.
Reset clears the laps along with the clock. There is no history kept anywhere, because nothing here is stored outside the page you have open.
How to use the stopwatch full screen
Press F for fullscreen, then Start. Lap records a split without stopping the clock, and Reset clears everything.
The buttons stay visible rather than fading away, because a stopwatch you have to move the mouse to control is a stopwatch that has already lost you the moment you wanted to catch.