About the Online Stopwatch
The Online Stopwatch measures elapsed time with hundredth-of-a-second precision, right in your browser. It uses the high-resolution performance timer, so it stays accurate even if your computer is busy, and the large digits are easy to read from across a room or on a projector.
Record laps to track each round of a workout, race, or presentation segment: every lap shows both the split time for that lap and the total elapsed time. Keyboard shortcuts make it quick to use without looking: press Space to start and stop, L for a lap and R to reset. It is useful for sports training, cooking, speed-typing practice, experiments, speeches and productivity sprints.
How to use the Online Stopwatch
- Click Start or press Space to begin timing.
- Click Lap or press L to record lap times.
- Click Stop or press Space to pause, then Resume to continue.
- Click Reset or press R to start over.
Frequently asked questions
Does the stopwatch keep running in a background tab?
Yes. Time is calculated from the system clock, so it remains accurate even if you switch tabs; the display catches up when you return.
How accurate is it?
It measures time using the browser's high-resolution timer and displays hundredths of a second.
Will I lose my time if I refresh?
Yes. Refreshing or closing the page resets the stopwatch.