How accurate is this online stopwatch?

It calculates elapsed time using the high-resolution browser Date performance API for millisecond accuracy.

Can I record multiple laps?

Yes! Click the "Lap" button whenever you want to log a split time in the scrollable table below.

Yes, because elapsed time is computed from the initial start timestamp, switching tabs does not slow down or disrupt timing.

Yes, fully optimized for touchscreen taps on mobile phones and tablets.

Press the "Start" button to begin timing.

Click "Lap" while running to record split interval times in the table.

Click "Pause" to temporarily halt the timer without losing your progress.

Click "Reset" to clear elapsed time and lap history back to zero.

High-precision millisecond timing display

Unlimited lap time split recording table

Smooth start, pause, resume, and reset controls

Large readable digital clock font

Runs locally in your browser with zero battery drain

Use the lap function to benchmark split times during running or swimming workouts.
Use for Pomodoro study sprints to measure focused working intervals.

Set custom live countdown timers for events, exams, launches, and deadlines.

Convert Unix epoch timestamps to human-readable dates (UTC, ISO 8601, Local).

Compare and convert local times across global timezones (UTC, EST, PST, GMT, IST, JST).