Stopwatch
A precise stopwatch with lap timing functionality. Track time accurately for sports, productivity, or any timing needs.
Accurate to 10 milliseconds. Use the lap button to record split times while the timer continues running. Perfect for sports, workouts, or any timing task.
How to use the online stopwatch
Start, record laps if you need splits, and stop when you're done.
- 01
Start timing
The display shows minutes, seconds and hundredths, as in 03:27.45. Minutes keep counting past 60, so two hours reads as 120:00.00.
- 02
Press Lap at each split
Each lap shows two figures: the lap's own time with a + in front, and the total time when you pressed it. The newest lap is at the top.
- 03
Pause, resume or reset
Pause stops the clock without losing laps. Reset sets it back to zero, and the trash button clears the lap list on its own.
How accurate a browser stopwatch is
The stopwatch notes the real time when you press Start and, every 10 milliseconds, shows the difference from now. Because it reads the clock rather than counting ticks, it doesn't drift, even when a tab is hidden and the browser slows its timers. Over an hour it stays as accurate as your device's clock.
The limit is your reaction time, not the code. Starting and stopping by hand typically adds around 0.1 to 0.3 seconds of human delay, which is far more than the display's 0.01-second resolution. That's fine for workouts, cooking and timing a talk. For a race result that has to stand up, you'd want electronic timing gates. The state is also saved in your browser, so a reload or an accidental tab close doesn't lose a running time or your laps.
Using laps for splits and intervals
Laps are most useful when you compare them. Say you run four laps of a 400 m track and press Lap at the end of each: +1:52.00, +1:55.00, +1:58.00 and +1:49.00. The total reads 7:34.00 for 1,600 m, an average of 1:53.50 a lap, or about 12.7 km/h. The lap column shows at a glance that the third lap was slowest and the last was fastest.
The same works away from sport. Time each section of a presentation rehearsal, each step of a recipe, or each task in a work session, and the lap list shows where the minutes actually went.