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Timing tool
Free browser-based stopwatch with millisecond precision. Track laps, pause and resume at any time. No downloads, no ads, no sign-up required.
Features
Click Start to begin timing. Pause at any moment and resume exactly where you left off. The total elapsed time is preserved across pauses.
While the stopwatch is running, click Lap to record split times without stopping the timer. Each lap shows the time for that interval and the total elapsed time.
After pausing, click Reset to clear the timer and all recorded laps. This gives you a fresh start for your next timing session.
Common use cases
Time your workout intervals, rest periods, or entire sessions. Lap times let you compare performance across sets without stopping the clock.
Track how long something has been in the oven or on the stove while doing other kitchen tasks. Lap mode is useful for multi-step recipes with different timing for each stage.
Measure how long you spend on a task to understand your productivity patterns. Many students time their study blocks to maintain discipline and track progress over weeks.
Keep a meeting on schedule by timing each agenda item. Lap splits show how long each topic took without interrupting the flow of discussion.
Time races, drills, or practice runs. Lap mode records split times for each lap so you can compare performance across rounds.
Record the duration of observations or reactions. Millisecond precision is useful for physics, chemistry, and biology experiments that require accurate timing.
Why online
Open the page and start timing. No app store downloads, no storage space, no permission requests.
Desktop, laptop, tablet, or phone. The same stopwatch on every screen without platform-specific apps.
A clean, focused timer without banner ads, pop-ups, or upsell screens. Just a stopwatch that works.
Bookmark the page and it is there whenever you need it. Works offline after the first load.
Frequently asked questions
The stopwatch uses requestAnimationFrame and the performance.now() API, which provides sub-millisecond precision. It is accurate to within a few milliseconds over extended periods, making it suitable for sports timing, cooking, studying, and general purpose use.
Yes. The stopwatch continues running in the background even if you switch browser tabs or minimize the window. When you return, the displayed time will be accurate to the moment you left. This works because the timer is based on the browser's high-resolution clock, not CSS animations.
A lap time shows how long the current lap took. The first lap records the total elapsed time from the start. Each subsequent lap shows the time between the current and previous lap button press. The total time continues running regardless of how many laps you record.
Yes, the stopwatch works on any device with a modern web browser, including iPhones, Android phones, tablets, and desktop computers. The interface adapts to your screen size and is fully touch-friendly.
After the page loads for the first time, the browser caches the stopwatch files. If you lose internet connectivity after loading, the stopwatch will continue to function. However, you need an initial connection to load the page.