Online stopwatch
Precise to a hundredth of a second — with lap times.
A precise stopwatch in your browser
This stopwatch measures with your device's high-resolution clock, so it stays accurate to the hundredth of a second even during long sessions. Record as many laps as you like — each lap shows its split time and the total.
It works offline once loaded and runs on any phone, tablet or desktop. For countdowns, use the online timer instead.
Frequently asked questions
How accurate is the stopwatch?
It measures with your device's high-resolution clock, precise to a hundredth of a second — and it stays accurate over long sessions because elapsed time is computed from timestamps, not from counting ticks.
Does it keep running in a background tab?
Yes. Because the elapsed time is derived from timestamps, the stopwatch shows the correct time even after the tab was inactive for a while.
How many laps can I record?
As many as you like. Each lap shows its own split time and the running total.