About the online stopwatch
A simple, accurate online stopwatch for timing anything. Track lap times with best, worst, and average lap statistics, copy your laps or export them to CSV, pause and resume, and reset when you're done. Works on desktop and mobile browsers.
Accuracy method: elapsed time is calculated from absolute epoch timestamps rather than counting interval callbacks. That lets the display recover after tab throttling or device sleep; the 10 ms refresh rate affects visual smoothness, not the measured result. A running stopwatch and its laps survive a reload.
Common uses
Timing workouts and exercises
Tracking lap times for running or swimming
Timing cooking or baking
Measuring task duration
Board game turn timing
How to use the stopwatch
- Press StartThe stopwatch counts up in hundredths of a second. Press Stop to pause it and Resume to carry on.
- Press Lap for splitsEach lap shows its split and the running total; with two or more, the best, worst and average appear above the list.
- Keep your lapsCopy laps puts them on the clipboard as a table; Export CSV downloads them with lap numbers, splits and totals.
- Read it across the roomFullscreen fills the screen with the time and the lap in progress; Float keeps a small stopwatch over other windows.
Keyboard shortcutsSingle keys, no modifier needed
SpaceStart / Stop / ResumeLRecord lap timeRReset stopwatchFFullscreen
Stopwatch FAQ
How do I use the online stopwatch?
Press Start to begin timing, Lap to record split times, and Stop to pause. Press Reset to clear the stopwatch and start over. You can also use keyboard shortcuts for faster control.
Can I record lap times?
Yes. Tap Lap while the stopwatch runs to capture a split without stopping the clock. Each lap is listed so you can compare times across intervals.
Can I see lap statistics or export my lap times?
Yes. With two or more laps, the stopwatch shows your best, worst, and average lap times above the lap list, highlighting the best and worst laps. Use the Export CSV button below the lap list to download your laps as a CSV file with lap numbers, split times, and total times.
Does the stopwatch keep running if I switch tabs?
Yes. The stopwatch keeps timing accurately in the background even if you switch tabs or minimize the browser, because it tracks elapsed real time.
Is the online stopwatch free?
Yes, the stopwatch is completely free with no signup, no downloads, and no ads. It works on desktop, tablet, and mobile browsers.