Online Stopwatch
Start, stop and record laps to the hundredth of a second. Your best and slowest laps are highlighted.
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How do I record lap times?
How do I record lap times? Press Start, then press Lap (or the L key) each time a lap finishes. Each lap time and the running total are listed below the stopwatch, with the fastest lap in green and the slowest in red.
How to use the online stopwatch
- Press Start or the Space key.
- Press Lap or L to record a split.
- Pause with Space, then Reset or R to clear.
- Copy the lap table to paste into a spreadsheet.
Features
- 1/100 second display
- Unlimited laps with lap and total time
- Best, worst and average lap
- Copy laps as tab-separated text
- Keeps running correctly in background tabs
Good for
- Track and swimming laps
- Timing experiments in science class
- Speedcubing and speedruns
- Measuring how long tasks take
Frequently asked questions
How accurate is the stopwatch?
Elapsed time is measured from the device clock, so it is as accurate as your system time, typically within a few milliseconds. The display updates about 30 times a second; the stored lap times are exact to the millisecond. Human reaction time when pressing the button is the largest source of error.
What is the difference between a lap and a split?
A lap time is the time for one segment; a split (or total) is the time elapsed since the start. The table shows both.