Online Stopwatch
Time anything with start, stop, lap and reset controls, accurate to a hundredth of a second.
Stopwatch
Keyboard: Space start/stop · L lap · R reset
| Lap | Lap time | Total | vs average |
|---|
Runs in your browser — nothing you enter is uploaded or stored.
Scratchpad auto-saved
About the Stopwatch
Press Start to begin timing and the display updates continuously, showing minutes, seconds and centiseconds (hundredths of a second). Pressing the same button again stops the clock while keeping the elapsed time, so you can start and stop as many times as you need without losing the running total.
Lap records a split: the table shows the time for that individual lap alongside the cumulative total, with the newest lap at the top. This is perfect for comparing repeated efforts — running intervals, sets in a workout, or steps in a process. Reset clears the clock and every recorded lap back to zero.
The stopwatch uses your browser's animation frame for a smooth, accurate display and cleans itself up when stopped, so it won't drain your battery in the background. Nothing is recorded or uploaded — it runs entirely on your device.