Stopwatch
Free online stopwatch with lap timer. Start, pause, reset and record lap times. Works on all devices.
About This Stopwatch
Our free online stopwatch is accurate to the hundredth of a second (centisecond). It is perfect for timing workouts, cooking, studying using the Pomodoro technique, sports activities, science experiments and any activity that requires precise time measurement.
The lap timer feature lets you record individual lap or split times without stopping the main timer — ideal for running laps, swimming lengths, or any repetitive timed activity where you need to track each segment separately.
Frequently Asked Questions
How accurate is this stopwatch?▼
Our stopwatch updates every 10 milliseconds (centisecond level accuracy), making it accurate to 0.01 seconds — suitable for most sports and everyday timing needs.
Can I record lap times?▼
Yes. Click the Lap button while the stopwatch is running to record a lap time. All laps are shown with both the lap split time and total elapsed time.
Will it keep running if I switch tabs?▼
The stopwatch uses JavaScript timers which may slow down in background tabs. For important timing, keep this tab active.
Is this stopwatch free?▼
Yes, 100% free. No account, no sign-up, no download needed.