Loading the interactive tool… It runs in your browser — if it doesn't appear, enable JavaScript.
A stopwatch that does what the one on your wrist does, on a screen big enough to read across a room: start, pause, resume, lap. Lap times record both the split (time since the last lap) and the total, and timing is anchored to your device clock — pausing, resuming or switching tabs never loses a centisecond.
Frequently asked questions
How accurate is a browser stopwatch?
Display updates run at your screen's refresh rate, and elapsed time is computed from the system clock rather than counted in ticks — so the reading is accurate to the centisecond shown, even after long runs or tab switches.
What's the difference between lap time and split time?
Each lap row shows both: the + value is that lap alone (since the previous lap), and the right-hand value is total elapsed time at the moment you pressed Lap.
Does the stopwatch keep running if I close the tab?
No — closing the tab ends it (nothing is stored or tracked). Switching tabs is fine; the count continues exactly because it's clock-anchored.