How accurate is this stopwatch?

The stopwatch uses your browser's high-resolution timer and updates every 10 milliseconds for smooth, accurate timing.

What is the difference between lap and split time?

A lap time is the duration of a single lap (from the previous lap mark to the current one). A split time is the total elapsed time from the start.

No. You can record as many laps as you need. All laps are displayed in a scrollable list.

Yes. The stopwatch calculates elapsed time based on timestamps, so it stays accurate even when the tab is in the background.

Start, stop, and record lap times with millisecond precision.

00:00:00.00

Step 1

Press Start to begin timing.

Step 2

Press Lap to record a lap time.

Step 3

Press Stop to pause the stopwatch.

Step 4

Press Reset to clear everything and start over.

Millisecond-precision timing display (HH:MM:SS.ms).

Lap time recording with lap number and split time.

Start, stop, reset, and lap controls.

Continues running accurately in background tabs.

Completely free with no sign-up required.

: The stopwatch uses your browser's high-resolution timer and updates every 10 milliseconds for smooth, accurate timing.
: A lap time is the duration of a single lap (from the previous lap mark to the current one). A split time is the total elapsed time from the start.
: No. You can record as many laps as you need. All laps are displayed in a scrollable list.
: Yes. The stopwatch calculates elapsed time based on timestamps, so it stays accurate even when the tab is in the background.