About Stopwatch
The Online Stopwatch measures elapsed time with centisecond (1/100 s) precision — start, pause, resume and reset with a single click or tap. Record unlimited laps and see both the individual lap time and the cumulative total for each one.
It's great for workouts, HIIT intervals, speedcubing, cooking, classroom activities and any task you want to time. The timer is based on your device's clock rather than counting screen refreshes, so it stays accurate even if the tab briefly loses focus.
No app to install and nothing to sign up for — the stopwatch runs entirely in your browser.
How to Use the Stopwatch
- Click Start to begin timing.
- Click Lap to record a split without stopping the clock.
- Use Pause and Resume as needed, and Reset to clear everything.
Features
- Centisecond precision with a large, readable display
- Unlimited laps with per-lap and cumulative times
- Pause and resume without losing time
- Accurate even when the tab is in the background
Frequently Asked Questions
How accurate is the stopwatch?
It's anchored to your device's system clock, so total elapsed time is accurate to a few milliseconds regardless of display refresh rate or background throttling.
Will it keep running if I switch tabs?
Yes. Because the elapsed time is computed from the start timestamp, switching tabs or minimizing the browser doesn't lose any time — the display catches up instantly when you return.
Is the Stopwatch free?
Yes, the Stopwatch is completely free with no usage limits. No signup, no account and no installation required.
Does the Stopwatch work on mobile?
Yes. The Stopwatch is fully responsive and works in any modern browser on phones, tablets and desktops.
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