Math
Online Stopwatch
A free online stopwatch with lap times, accurate to a hundredth of a second. Start, pause, record laps and reset in one tap.
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Online Stopwatch
A free online stopwatch with lap times, accurate to a hundredth of a second. Start, pause, record laps and reset in one tap.
The Stopwatch tool is a highly responsive time-tracking utility designed for sports, experiments, or any activity that requires precise measurement of elapsed time. With a minimalist interface, it offers everything you need to start, pause, and record lap times instantly.
To begin, click the Start button; the clock will immediately start incrementing. You can record a specific moment by clicking the Lap button, which saves the timestamp to a list below. When finished, simply click Pause and then Reset to clear all data and start over.
For example, in a running exercise, you can record a 10-second lap time, then wait another 15 seconds and record a 25-second total time; the tool will show both the current interval and the overall elapsed time in a clear, tabular list format.
Everything runs within your browser, ensuring no delay and maximum privacy. It is perfectly optimized to keep counting even if you navigate through different parts of the site, making it a reliable partner for your timing needs.
Key Features
- Online Stopwatch: 100% free, no sign-up
- Instant results as you type
- Private: runs in your browser
- Works on phone, tablet and desktop
- Available in English, Spanish, French and Arabic
How it works
The stopwatch maintains state using performance.now() and an interval timer, calculating the time difference between the current frame and the start time.
Worked example
Frequently asked questions
Is the timing precise?
Yes, it uses the high-resolution system time, making it accurate enough for personal sports and hobbyist needs.
What happens if I close the window?
The timer will stop, as the data is stored only in your browser session for privacy.
Can I record multiple laps?
Yes, you can record as many laps as you need, and they will be listed in order for you to review.
Does it work in the background?
Yes, as long as the page remains open in your browser, the timer will continue running.
Is it free to use?
Yes, this tool is completely free and accessible directly from your browser.