Online Stopwatch / Timer
Use it as a stopwatch to measure elapsed time with hundredth-of-a-second precision and lap tracking, or as a countdown timer with a sound alert when it reaches zero.
How to use the stopwatch and timer
The stopwatch measures elapsed time from the moment you click start, with hundredth-of-a-second precision. Use the Lap button to record split times without stopping the count — useful for workouts, races and any timed activity.
The timer works the other way around: set hours, minutes and seconds, and the tool counts down, playing a sound alert when it reaches zero. It's great for the Pomodoro technique, cooking, presentations and scheduled breaks.
Frequently asked questions
Does the stopwatch keep running if I switch tabs?
Yes. Time is calculated from the system's real clock, so even if the tab runs in the background the count stays accurate when you come back to it.
How does lap tracking work?
Each time you click Lap, the tool stores the split time since the previous lap and the accumulated total time. The fastest lap is highlighted in green and the slowest in red.
Does the timer make a sound when it finishes?
Yes, when the countdown reaches zero the browser plays a short sound alert to let you know time is up.
Is the data saved if I refresh the page?
No. The stopwatch and timer run locally in your browser and reset if the page is reloaded.
Related tools
- World ClockSimultaneous times across multiple time zones
- Date DifferenceCalculate days, months and years between two dates
- Timestamp ConverterUnix timestamp to readable date and vice versa