Stopwatch
Accurate to the hundredth of a second, with lap tracking.
Last updated
How to use the online stopwatch
- Click Start to begin timing; the button becomes Pause.
- Click Lap to record a split without stopping.
- Click Reset to clear the time and laps.
About this tool
Elapsed time is measured from a real start timestamp rather than accumulated tick-by-tick, so pausing and resuming stays accurate over long sessions. Each lap records both the split (time since the previous lap) and the cumulative total, with the fastest and slowest splits highlighted once you have three or more laps.
Nothing here is sent to a server — the entire stopwatch runs as JavaScript in your browser tab.
Questions about the stopwatch
How accurate is it?
It shows hundredths of a second and measures from a real start time rather than counting ticks, so it doesn’t drift over long sessions.
What is the difference between a split and a total?
A split is the time since the previous lap; the total is the time since you started. Both are shown for each lap.
Which laps are highlighted?
Once you have three or more laps, the fastest and slowest splits are marked.
Does it keep running in the background?
Yes. It works from timestamps, so the time is right when you come back to the tab. It stops if you close the tab.