Stopwatch
A simple online stopwatch with lap times and hundredth-of-a-second precision. Time reading sprints, presentations, experiments, or workouts — the elapsed time also shows in your tab title while it runs.
00:00.00
minutes : seconds . hundredths
Frequently Asked Questions
- How accurate is this online stopwatch?
- The stopwatch reads your device's clock on every update instead of counting ticks, so it stays accurate to the hundredth of a second even if the browser briefly slows down or the tab is in the background.
- How do lap times work?
- Press Lap while the stopwatch is running to record a split. The table shows each lap number, the time for that lap alone, and the total elapsed time when you pressed the button.
- Does the stopwatch keep running in another tab?
- Yes. Because the elapsed time is calculated from your device's clock, switching tabs or minimizing the window does not affect it. The running time also shows in the tab title so you can see it at a glance.
- What does the display format mean?
- The display shows minutes, seconds, and hundredths of a second (mm:ss.cc). For example, 02:35.48 means 2 minutes, 35 seconds, and 48 hundredths.
- Is this stopwatch free?
- Yes. It is completely free, needs no account or install, and runs entirely in your browser — nothing is sent to a server.