About this stopwatch
An online stopwatch is a timer that counts up from zero so you can measure how long something takes. Press Start to begin, Stop to pause without losing your time, and Reset to clear it back to zero. The Lap button records the time for each segment along with the running total — useful for runners timing intervals, cooks timing steps, or anyone timing repeated tasks. It reads the time from your device's clock and only counts while running, so it stays accurate over long sessions. Everything happens in your browser; nothing is uploaded or stored.
Frequently asked questions
- How accurate is this online stopwatch?
- It uses your device's high-resolution clock and only counts the time the stopwatch is actually running, so it stays accurate even when you pause and resume and does not drift over long sessions.
- What does the lap button do?
- Each tap records a lap, showing how long that single lap took and the total time so far. It is handy for timing repeated activities like running intervals or workout sets.
- Does the stopwatch keep running if I switch tabs?
- Yes. The elapsed time is measured from the real clock, so when you come back to the tab the display catches up to the correct time.