About the Online Stopwatch
Time a run, a workout interval, a speech, a presentation or a cooking step with a precise stopwatch right in your browser. The display shows hours, minutes, seconds and hundredths, and keeps counting correctly even if you switch to another tab.
Press “Lap” to record splits: the lap table shows each lap time and the running total, with your fastest and slowest laps highlighted. Use the keyboard to keep your hands free — Space starts and pauses, L records a lap and R resets.
How to use the Online Stopwatch
- Press “Start” (or the Space bar) to begin timing.
- Press “Lap” (or L) to record a split without stopping the clock.
- Press “Pause” to stop, then “Resume” to carry on from where you left off.
- Press “Reset” (or R) to clear the time and laps, or “Copy laps” to save them.
Frequently asked questions
How accurate is this stopwatch?
It measures time with the browser’s high-resolution clock (performance.now) instead of counting timer ticks, so it does not drift. The display shows hundredths of a second.
Does it keep running in a background tab?
Yes. The elapsed time is calculated from the moment you pressed Start, so it stays correct when you switch tabs or minimise the window. The display simply catches up when you come back.
What is the difference between lap time and total?
Lap time is how long that lap took on its own. Total is the overall time on the stopwatch when you pressed Lap.
Are my times saved?
No. Everything stays in this page and is cleared when you reset or close it. Use “Copy laps” to paste your results somewhere else.