How to use Stopwatch
- Choose hundredths of a second for short efforts, or whole seconds for a steadier display.
- Select Start stopwatch, or use Start beside the display.
- Select Lap to record a split and the running total at that moment.
- Pause to hold the reading, and Reset to return the display and the lap list to zero.
Example: Stopwatch
Time a set of short runs and keep a lap for each one.
Options
- Display precision
- Hundredths suit sprints, reactions and short tasks. Whole seconds keep the digits calmer over a long session, and laps record the same detail either way.
- Screen wake lock
- While the stopwatch runs, the page asks to keep the screen awake where the browser allows it. When support is missing or the request is refused, the stopwatch keeps timing and the state line reports the limitation.
Supported inputs and limits
Where your input is processed
This tool processes your input in this browser. Your text and files are not uploaded to UseFreeTools. Check this tool's limits for anything it may save on your device.
One clock and many marks
A lap is not a separate timer. The stopwatch keeps one start moment, and each lap records how much time had passed when you pressed the button plus the difference from the previous mark. That is why the splits and the running total always agree, and why pausing one reading leaves the laps already recorded untouched.
Questions about Stopwatch
Do the lap splits add up to the total?
Yes. Each row shows the split since the previous lap and the running total at that mark, so the final running total matches the elapsed time.
What happens if my screen turns off?
The elapsed time comes from the clock, so the stopwatch shows the full time when the screen comes back, including the part of the session that ran while the display was off.
Can I type in a time I already measured?
No, this page measures the moments when you start, lap and pause. Use the Duration Calculator to add times you already have.