Online Stopwatch
A precise stopwatch with lap and split times – start, lap, stop, and export the results.
A free stopwatch that measures to the hundredth of a second and keeps correct time even when the tab is in the background. Record as many laps as you need, see your fastest and slowest lap, and copy or download the results.
What is an online stopwatch?
An online stopwatch counts elapsed time upward from zero. It is used for workouts and running laps, speeches, cooking steps, experiments, games and any task where you need to know exactly how long something took.
This stopwatch reads the browser's high-resolution clock instead of counting ticks, so the time stays accurate even if the screen refresh is slow or the tab is inactive. Lap times show both the split of each lap and the total time.
How to use the stopwatch
- Press Start (or Space) to begin timing.
- Press Lap (or L) to record a lap; the fastest lap is shown in green, the slowest in red.
- Press Stop, then copy the laps or download them as a CSV file, or press Reset to start over.
Frequently asked questions
- How accurate is the stopwatch?
- It displays hundredths of a second and is based on the browser's high-resolution timer, so it does not drift when the tab is in the background. Your own reaction time is the limiting factor.
- Does it keep running if I switch tabs?
- Yes. The elapsed time is calculated from the clock, not from screen updates, so it is correct when you come back.
- Is anything stored or uploaded?
- No. Everything runs in your browser and nothing is sent anywhere.