A big online stopwatch with hundredths of a second and lap times. Press Space to start and stop and L to record a lap, then go fullscreen so everyone can see it. It keeps counting in a background tab and even after you reload the page.
How to use the stopwatch
- Press Start, or Space on a keyboard.
- Press Lap, or L, to record a lap. Each lap shows its own time and the total.
- Press Stop, or Space, to pause. Start again to carry on from the same time.
- Press Reset, or R, to clear the time and the laps.
What people time with it
- Sport and workouts
- Laps on a track, intervals in the gym, planks and stretches.
- Classroom experiments
- Time a reaction or a pendulum on the projector for the whole class.
- Speeches and rehearsals
- See how long a talk runs. For a fixed limit, use the countdown timer.
Questions
How accurate is it?
It measures from the moment you press Start using your device's clock, so it does not drift, even in a background tab. The display updates many times a second.
How many laps can I record?
Up to 99. The screen shows the latest eight.
Does it keep running if I close the tab?
If you close the tab and open the page again, it carries on from the original start time.
How do I go fullscreen?
Press F on a keyboard, or use the fullscreen button in the bar at the bottom. Press Esc or F again to leave. On iPhone, Safari does not allow real fullscreen, so add the page to your home screen for the cleanest view.