Online Stopwatch
Click Start to begin timing - use Lap to record split times without stopping the clock, and Reset to clear it.
Last updated: September 5, 2026
Frequently asked questions
How precise is this stopwatch?
It displays to a tenth of a second, updated continuously in your browser - accurate enough for everyday timing, though very high-precision athletic timing typically needs dedicated hardware.
What does the Lap button do?
It records a split time without stopping the overall clock - each lap shows both the time since the previous lap and the total elapsed time, listed most recent first.
Does the stopwatch keep running if I switch browser tabs?
Yes - it keeps timing in the background as long as this tab stays open, even if it's not the active tab. Closing the tab or browser stops it.
Can I pause and resume instead of stopping completely?
Yes - the Start button toggles to "Stop" while running; clicking it again pauses the clock, and clicking "Resume" continues from where it left off. Use Reset to clear the time back to zero.
Is there a limit to how long the stopwatch can run?
No practical limit - it keeps counting hours, minutes, seconds, and tenths for as long as the tab stays open, useful for tracking long tasks as well as short intervals.
How many laps can I record?
There's no fixed cap - each click of Lap adds another entry to the list, so you can record as many splits as your activity needs, all displayed most recent first.
Is a browser stopwatch accurate enough for competitive timing?
It's accurate to a tenth of a second for everyday use like workouts or presentations, but competitive or record-setting timing (races, official sports) requires certified hardware timers rather than a browser-based clock.