Online Stopwatch
Press Start or Space
Laps, splits and best lap
Every lap shows its own time and the running total. The fastest lap is marked in one colour and the slowest in another, so you can see at a glance where pace dropped. The list scrolls on a phone and stays readable on a projector.
When you are done, download the laps as a CSV file and open them in a spreadsheet, a training log or a report.
Accurate in the background
The stopwatch reads the system clock instead of counting ticks, so it keeps correct time when you switch apps, lock the screen or the tab goes to sleep. Leave it running during a long session and come back to the right total.
Space starts and stops, L records a lap, R resets and F opens fullscreen.
Good for
Running and swimming splits, timing speeches and reading fluency, science experiments, cooking tests and checking how long a task really takes.
Questions
How precise is the stopwatch?
It shows hundredths of a second and is measured against the system clock, so it stays accurate over long runs.
Can I save my lap times?
Yes. Export the laps as a CSV file. The current session also stays in your browser if you reload the page.
Does it work offline?
Yes. Once the page has loaded, the stopwatch works without internet.