How to use the Online Stopwatch
- Press Start (or the Space bar).
- Press Lap to record split times.
- Press Pause to stop, and Reset to clear.
- Use full screen for classrooms and workouts.
What does this tool do?
The stopwatch measures time with your browser's high-resolution clock, so it stays accurate even if the display updates late. Lap times show both the split and the running total.
Why use it?
- Workouts, cooking and experiments.
- Big full-screen display for groups.
- Copy lap times as text.
Keyboard shortcuts
Space starts and pauses, L records a lap, and R resets.
Privacy
Everything you type is processed in your browser. Nothing you enter is sent to our servers or stored by us. There's no account to create and nothing to install.
Frequently asked questions
Are there keyboard shortcuts?
Yes. Press Space to start and stop, L to record a lap and R to reset.
Does it keep time if I switch tabs?
Yes. The stopwatch measures elapsed time from your device's clock, so it stays accurate even when the tab is in the background. The display catches up as soon as you return.
Last reviewed by the M2Toolkit team.