Online Stopwatch

A precise stopwatch with lap times, right in your browser.

00:00.00

Keyboard: space to start and stop, L to record a lap.

Elapsed time is measured against the system clock rather than by counting animation frames, so it stays accurate to a few milliseconds even if the tab loses focus.

What does Online Stopwatch do?

Time anything to hundredth-of-a-second precision with lap and split recording. It measures against the real clock rather than counting frames, so accuracy holds even when the tab is not in focus.

How to Use Online Stopwatch

1
Press startOr hit the space bar.
2
Record lapsTap lap, or press L.
3
Stop and reviewLap times are listed with splits.

Key Features

Hundredth-of-a-second precision
Lap and split times recorded in a table
Fastest and slowest laps highlighted
Keyboard shortcuts: space to start and stop, L for a lap
Full-screen mode with a large display
Export lap times as CSV

Frequently Asked Questions

How accurate is a browser stopwatch?

Elapsed time is accurate to a few milliseconds because it is measured against the system clock, not by counting animation frames. The display updates about 60 times a second, so the visible hundredths are smooth.

What is the difference between lap and split time?

Lap time is the duration of that individual segment. Split time is the total elapsed since the start. Both are shown, since runners and swimmers use each for different purposes.