Simple, fast, and private
This stopwatch runs entirely in your browser using native JavaScript timing APIs. There is no login, no server processing, and no saved history unless you choose to record it yourself.
Precision browser stopwatch
Back to ClockOnline Stopwatch with Seconds
Measure elapsed time with seconds and milliseconds in a fast, private browser stopwatch.
00:00:00.000
Measure elapsed time
Start the stopwatch for workouts, tests, calls, production cues, or classroom activities and pause it whenever you need a precise elapsed-time reading.
Designed for quick timing
The controls stay simple and local to the browser, so you can open the page, start measuring, and reset without setup or sign-in.
Frequently asked questions
What is this stopwatch for?
Use it to measure elapsed time with seconds and milliseconds in your browser.
Is the stopwatch private?
Yes. Stopwatch timing happens on your device and does not require a server account.
Why does the stopwatch show milliseconds?
Milliseconds help with short events, tests, practice sessions, and timing checks where seconds alone are not precise enough.