Online Stopwatch

How to use this stopwatch

Start: begins the timer. The display updates every 10 milliseconds.
Lap: records the current time as a split without stopping the clock. Useful for tracking intervals, running laps, or cooking stages.
Stop / Reset: the Start button doubles as Stop once running. Reset clears all laps and returns the display to zero.
Keep the tab open: the timer runs entirely in your browser. Closing the tab resets the session.

Accuracy depends on your browser's performance.now() clock, which is typically accurate to within 0.1–1 millisecond on modern devices — more than enough for sports, cooking, presentations, or benchmarking.

Common use cases

Sports and fitness

Track workout intervals, rest periods, HIIT sessions or running splits. The lap function lets you record each round without interrupting the total time.

Cooking and baking

Measure rises, simmers, or rest times precisely. If you need a fixed countdown instead, use our online timer.

Study and productivity

Use it as a Pomodoro focus tracker or to log time spent on tasks. Record a lap at each task transition.

Development and testing

Useful for manual benchmarking of UI flows, load times, or QA scenarios when you want a quick millisecond reading.

Frequently asked questions

Does the stopwatch keep running if I close the tab?

No. The stopwatch runs in your browser's JavaScript runtime, so closing or reloading the tab resets it. Keep the page open while timing.

Is it accurate to the millisecond?

Yes. We use the high-resolution timer available in modern browsers, typically accurate to less than 1 ms. Display refreshes every 10 ms to stay readable.

Can I export my lap times?

Laps are shown on screen for the duration of the session. You can copy them manually. We don't store any data on our servers.

Does it work on mobile?

Yes. The stopwatch is fully responsive and works on phones, tablets, and desktops without installing anything.

Is it free?

Completely free. No account, no registration, no limits.