Online Stopwatch
A simple, accurate stopwatch — start, stop, record lap/split times, and reset. Counts up to hundredths of a second. Great for workouts, cooking, study sprints and timing tasks. Runs in your browser.
FAQ
How accurate is this stopwatch?
It measures elapsed time with the browser's high-resolution timer (performance.now), so it shows real elapsed time even if the display stutters. Hundredths of a second are displayed.
What are lap and split times?
Press Lap while running to record the moment. Each entry shows the split (since the previous lap) and the total elapsed — handy for intervals and repeated runs.
Does it keep running in another tab?
Yes — it calculates elapsed time from timestamps, so it stays correct in the background and catches up when you return.
Do I need an app or account?
No — it runs entirely in your browser; nothing to install and nothing uploaded.
More tools: online timer, Pomodoro timer, and the full tools list.