Online Stopwatch
Press Start — or the Space bar — and this stopwatch times to a tenth of a second. Record laps to compare splits as you go.
0:00.0
Tip: press Space to start and pause.
Laps
| Lap | Total | Split |
|---|
A simple, precise stopwatch
This stopwatch is built for everyday timing: running intervals, cooking, experiments, games, and work sessions. Because it measures from your device clock instead of counting animation frames, the reading stays honest even if you switch tabs mid-run.
Laps are the heart of it. Each press of the Lap button captures the total elapsed time and the split since your last lap, so you can see at a glance whether you are speeding up or slowing down.
Stopwatch questions
How accurate is this stopwatch?
It measures to a tenth of a second. Elapsed time is computed from your device clock, so it stays correct even if the tab was briefly in the background.
What is the Space bar shortcut?
Pressing Space starts the stopwatch, and pressing it again pauses. The shortcut is ignored while you are typing in a form field or focused on a button.
How do lap times work?
Press Lap while the stopwatch is running. Each lap records its number, the total elapsed time, and the split — the time since the previous lap.
Can I use it for sports timing?
Yes — it works well for running intervals, swimming sets, and any activity where you want lap or split comparisons.
Is the stopwatch free?
Completely free with no account or signup. Everything runs in your browser.