Online Stopwatch

Click Start to begin counting, click Lap to record a split without stopping the clock, click Stop to pause, click Reset to clear everything. Each lap shows up in a list with its split time and total elapsed time. Useful for run training, cooking multiple dishes at once, or tracking how long different parts of a process take. The stopwatch updates in real time and the lap list stays visible until you reset, so you can compare your splits side by side.

Hit Start when you begin and click the Lap button each time you complete a segment. The stopwatch records the time of each lap without resetting the main clock. So a 5-lap run shows you each lap's individual time and your cumulative time. Useful for athletes, cooks, and anyone tracking multi-stage processes. Click Stop when you're done. Reset clears the laps and zeroes the clock for your next session, ready for a fresh run.

Open the online stopwatch page and click Start. The clock begins counting immediately. No setup, no permissions, no download. The stopwatch keeps running even if you switch tabs (though some browsers may slow background tab updates). Click Stop to pause, Reset to zero. Works on laptops, tablets, and phones. Useful for cooking timers, workouts, presentations, kids' games, and any "how long did that take?" measurement during the day.

Open the stopwatch, click Start when your activity begins, click Stop when it ends. The elapsed time is displayed in hours, minutes, seconds, and (if supported) milliseconds. Reset clears the clock for the next measurement. Useful for timing speeches, cooking, exercise sets, code execution, or anything where you want to know how long something took without doing the math yourself. The display updates continuously so you can also watch progress live.

Use the Lap button (or "Split" depending on the tool's wording). Each click records the current elapsed time without stopping the clock. The list shows your splits one after another. Useful for running, swimming, cycling intervals, or any activity with multiple stages. The terms "split" and "lap" are sometimes used differently — splits often refer to absolute times, laps to differences between consecutive presses. Most stopwatches show both.

Some online stopwatches display milliseconds by default; others have a settings toggle to enable them. Click Start and the milliseconds tick away rapidly. Useful for sports requiring precise timing — sprints, swimming, or measuring fast processes. Note that millisecond accuracy is limited by browser refresh rates and your device's clock resolution, so the displayed millisecond may lag the actual time by a fraction. Fine for everyday use, but not lab-grade accuracy.

Click the Reset button after you've stopped the clock. The display goes back to 00:00:00 and the lap list clears. Most stopwatches require you to stop the clock first before reset works, so the sequence is Stop → Reset. Some tools let you reset while running, which immediately zeroes the clock and starts counting from zero. Useful between consecutive measurements where you don't want the previous time to interfere with the next reading.