Stopwatch

The stopwatch uses your browser's high-resolution performance timer (performance.now()) which provides sub-millisecond accuracy. Display updates every 10 milliseconds for smooth, readable output.

Yes. Click the blue Lap button while the stopwatch is running to record a lap split. Each lap shows its number, the split time since the last lap, and the total elapsed time. All laps are displayed in a scrollable list.

Yes. The stopwatch calculates elapsed time based on timestamps, not intervals, so it remains accurate even if you switch browser tabs or minimize the window.

The stopwatch can run for over 24 hours continuously. It displays hours, minutes, seconds, and milliseconds, so it is suitable for timing anything from sprints to long-duration events.

Yes. Press the Space bar to start or stop the stopwatch, the L key to record a lap while running, and the R key to reset when stopped.