Stopwatch — Free Online Tool
A precise stopwatch with lap times — start, stop, lap, and reset.
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About Stopwatch
The Stopwatch measures elapsed time with start, stop, lap, and reset controls, tracking time down to centiseconds for precise results. It suits workouts, cooking, study intervals, lab timing, and any activity where you want to know exactly how long something took.
Timing is driven by a high-resolution performance clock, so the readout stays smooth and accurate. The lap feature records intermediate times in an ordered list, making it easy to compare splits across multiple rounds.
How to Use Stopwatch
- Click Start to begin timing.
- Click Lap to record a split while the clock keeps running.
- Click Stop to pause, and Start again to resume.
- Click Reset to clear the time and all recorded laps.
Key Features
Precise timing down to centiseconds
Start, stop, and resume without losing time
Record unlimited lap splits
High-resolution clock for smooth updates
Clean monospace display
Frequently Asked Questions
How precise is the stopwatch?
It tracks time down to centiseconds, which is hundredths of a second, using a high-resolution browser clock.
What does the Lap button do?
Lap records the current elapsed time as a split while the stopwatch keeps running, letting you log multiple intervals.
Can I resume after stopping?
Yes. Clicking Start after a stop continues from the time where you paused rather than starting over.
Does Reset clear my laps?
Yes. Reset returns the display to zero and removes all recorded lap times.