Online stopwatch
Time anything to the hundredth of a second and record laps with one tap or the space bar.
00:00.00
Keyboard: Space start/stop · L lap · R reset
How to use the stopwatch
- Press Start or the space bar.
- Press Lap (or L) to record a split.
- Press Stop to pause and Reset (or R) to clear.
About this tool
An accurate stopwatch for workouts, races, experiments, presentations or speedruns. Press Start, record laps as you go, and every lap shows its own time and the running total.
Keyboard shortcuts make it quick on a computer: the space bar starts and stops, L records a lap and R resets.
Frequently asked questions
How accurate is the stopwatch?
It reads the device’s high-resolution clock, so elapsed time is accurate even if the display updates less often in a background tab. Human reaction time, about 0.2 seconds, is the bigger source of error.
What is the difference between a lap and a split?
A lap time is the duration of one lap; a split is the total time elapsed when the lap was recorded. The table shows both.
Does it keep running if I switch tabs?
Yes. Time is computed from the real clock, so switching tabs does not affect it.
Can I count down instead?
Use the online timer for countdowns. It is linked below.