- No data uploaded
- Instant results
Online Stopwatch
Start, stop and record lap times to the hundredth of a second. Press Space to start or stop and L for a lap — handy when your hands are busy.
Online Stopwatch
Keyboard: Space start / stop · L lap · R reset
| Lap | Lap time | Total |
|---|
How to use the stopwatch
- Press Start (or the space bar).
- Press Lap each time a lap, rep or split finishes — the table shows the lap time and the running total.
- Press Pause to stop the clock and Reset to clear everything.
Use the full-screen button to show large digits on a projector or a phone propped up across the room.
Lap time vs split time
A lap time is the duration of one lap on its own; a split (the “Total” column) is the elapsed time from the start to the end of that lap. Runners pace with lap times; race results are reported as splits.
Why it stays accurate
The stopwatch measures elapsed time from your device’s high-resolution clock rather than counting ticks, so switching tabs, locking the screen briefly or a busy computer never makes it drift. The display refreshes up to 60 times a second.
Common things people time
| Activity | Typical time |
|---|---|
| 100 m sprint (club runner) | 12–15 s |
| 400 m lap (recreational) | 1:30–2:30 |
| 1 km run (recreational) | 5–7 min |
| Plank hold (beginner) | 0:30–1:00 |
| Rubik’s cube (beginner) | 1–3 min |
| Speech or presentation slot | 5–10 min |
Frequently asked questions
Does the stopwatch keep running if I switch tabs?
Yes. Time is measured from the system clock, so it is correct when you come back, and the tab title shows the elapsed time.
How precise is it?
The display shows hundredths of a second. Human reaction time when pressing a button (about 0.2 s) is a far bigger source of error than the clock.
Can I copy my lap times?
Yes — after recording laps, use the copy button in the action bar to copy every lap and total.