Online Stopwatch
Press Start to begin timing and Lap to record splits. With two or more laps, the fastest lap is shown in green and the slowest in red.
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Stopwatch questions
- How accurate is the stopwatch?
- It measures elapsed time with the browser's high-resolution clock (performance.now()). The display shows hundredths of a second; the underlying measurement is finer than that.
- Does it keep running if I switch tabs?
- Yes. Elapsed time is calculated from the moment you pressed Start, not by counting screen updates, so the time is correct when you come back even if the browser paused drawing the hidden tab.
- How are the fastest and slowest laps shown?
- Once you have recorded two or more laps, the fastest lap time is shown in green and the slowest in red. Each row shows the lap time and the running total.
- Can I save my laps?
- Laps are kept only while the page is open. Reloading or closing the tab clears them, so copy the lap table out first if you need it.
Related time tools
World clockLive local time in major cities, with day/night and working-hours cues. Add your own cities; they are kept in this browser.Time zone converterConvert a date and time from one city or time zone to another. Daylight saving and date changes are handled for the exact date you pick.Exact timeCheck how far your device clock is from our server's reference time, and how to fix it if it has drifted.TimerCountdown timer with presets or a custom duration, pause and reset, and a beep when time is up.