About This Tool
A precise digital stopwatch with lap timing, split times, and millisecond accuracy. Start, stop, and reset with keyboard shortcuts. Record lap times to track intervals during exercise, cooking, experiments, or any timed activity. Export lap times for record-keeping.
Frequently Asked Questions
- How accurate is the timer?
- The stopwatch uses your browser's high-resolution performance timer (performance.now()), which provides sub-millisecond precision. Displayed accuracy is to the millisecond (0.001 seconds), which is more than sufficient for most uses.
- What is the difference between lap and split times?
- A split time is the total elapsed time from start. A lap time is the duration of the current interval (time since the last lap). For example, if you lap at 1:00 and 2:30, the split times are 1:00 and 2:30, but the lap times are 1:00 and 1:30.
- Can I use keyboard shortcuts?
- Yes. Space starts/stops the timer, L records a lap, and R resets. Keyboard shortcuts make the stopwatch usable without looking at the screen — useful during physical activities.
- Will the timer keep running if I switch tabs?
- Yes. The timer uses system time references rather than interval counting, so it remains accurate even if you switch browser tabs or minimize the window.