Online Stopwatch
Start, pause, lap and reset a precise stopwatch with millisecond display — right in your browser.
A precise online stopwatch
The Online Stopwatch times anything with centisecond precision, right in your browser — no app to install. Start and pause as many times as you like, record lap times to compare splits, and reset when you are done. The large, clear display makes it easy to read from across a room.
What you can time
- Workouts — intervals, rest periods, and circuits.
- Running and swimming — record laps and compare splits.
- Study and work — time focused sessions or tasks.
- Cooking, games, and experiments — anything that needs accurate timing.
How to use it
- Press Start to begin timing.
- Press Lap to record a split without stopping the clock.
- Press Pause to hold, and Start again to resume.
- Press Reset to clear the time and laps.
What lap times are for
Lap timing lets you record intermediate moments while the stopwatch keeps running. Runners use it to compare each lap's pace; coaches use it to track splits; and anyone repeating a task can see whether they are speeding up or slowing down. Each lap is stamped with the total elapsed time so you can review your performance at a glance.
Accuracy
| Feature | Detail |
|---|---|
| Precision | Displays minutes, seconds, and centiseconds |
| Timing source | Your device's high-resolution clock |
| Laps | Unlimited, timestamped from start |
Private and free
The stopwatch runs entirely in your browser using your device clock. Nothing is uploaded, there is no sign-up, and it is completely free.
Frequently asked questions
How precise is the stopwatch?
It displays minutes, seconds, and centiseconds (hundredths of a second), based on your device's clock.
Can I record lap times?
Yes. Press Lap while running to record a split. Laps are timestamped from the start and listed below.
Does it keep timing if I pause?
Pausing holds the time; pressing Start again resumes from where you left off. Reset clears everything.
Is it free?
Yes, completely free with no download, running entirely in your browser.