Online Stopwatch
About the Stopwatch
A precise stopwatch that counts up in minutes, seconds and centiseconds, with lap recording so you can capture split times without stopping the clock. It runs in your browser with no ads interrupting the timer and nothing to install. Keep the tab in view while you time something, because browsers can slow down background tabs.
This tool works in your browser: the files and text you use are processed on your device and are not uploaded.
How to use it
- Press the green button to start; press again to pause.
- Tap the flag button while running to record a lap.
- Press reset to clear the time and all laps.
Frequently asked questions
What precision does it show?
It displays minutes, seconds and centiseconds (hundredths of a second) in mm:ss.cs format.
Can I record lap times?
Yes. While the stopwatch is running, the flag button saves a lap; each lap is listed with its time so you can compare splits.
Does it keep running if my screen sleeps?
Timing is most reliable while the tab is visible and the device is awake. If the tab is backgrounded or the device sleeps, the browser may throttle updates, so keep it in the foreground for critical timing.