Stopwatch
Free online stopwatch with lap times. Accurate to centiseconds with start, stop, lap, and reset controls.
00:00.00
Frequently Asked Questions
How accurate is this stopwatch?+
It uses high-resolution timestamps (Date.now()) for accuracy to about 1ms. Display updates every 10ms. For casual timing, this is more than sufficient.
Does it work in the background?+
Yes. The stopwatch uses absolute timestamps, not interval counting, so it remains accurate even when the tab is backgrounded.