What Is a Stopwatch?
A stopwatch is a timekeeping tool that measures elapsed time from the moment you press start until you press stop. This online stopwatch provides millisecond-level precision and supports lap timing, making it ideal for workouts, cooking, studying, and any activity where accurate time tracking matters.
How to Use This Stopwatch
- Click the “Start” button to begin timing.
- Use the “Lap” button to record split times without stopping the main timer.
- Click “Stop” to pause the timer, then “Reset” to clear and start over.
Key Concepts
This stopwatch uses high-resolution browser timing APIs to deliver accurate measurements. Lap functionality records each interval independently, letting you compare splits during interval training or multi-step processes. The timer continues running in the background even if you switch tabs, so your measurement stays accurate throughout the session.
Frequently Asked Questions
How accurate is this online stopwatch?
It uses the browser’s high-resolution performance timer, which provides accuracy within a few milliseconds—more than sufficient for most practical timing needs.
Can I record multiple lap times?
Yes. Press the “Lap” button at any point to log a split time. All recorded laps are displayed in a list, showing both the individual lap duration and the cumulative elapsed time.
Does the timer keep running if I switch browser tabs?
Yes. The elapsed time is calculated from timestamps rather than frame-by-frame updates, so switching tabs or minimizing the browser does not affect accuracy.