Stopwatch & Timer
A two-in-one time tool: a stopwatch precise to centiseconds with a lap table, and a countdown timer you set in minutes and seconds that beeps when time is up. Everything runs in your browser — nothing to install.
How to use
- Stopwatch: press Start, use Lap to record split times while running, Pause to hold and Reset to clear.
- Timer: switch to the Timer tab and enter the minutes and seconds you need.
- Press Start to count down; you can pause and resume without losing accuracy.
- When time is up you’ll hear a beep and see a “Time is up” message.
Frequently asked questions
How accurate is the stopwatch?
The display refreshes every 50 ms and shows centiseconds; the measurement itself is based on the system clock, so it isn’t affected by screen refresh lag.
What does the Lap button do?
It records each lap’s own time plus the total elapsed time, shown in a table with the newest lap first — handy for running and repeated drills.
Does pausing the timer make it drift?
No. On resume, the end time is recomputed from now plus the stored remaining time, so the countdown stays accurate.
Why don’t I hear the beep sometimes?
Some browsers require a prior interaction with the page before allowing audio, or the device may be muted. Click any button on the page before starting the timer to ensure the beep works.