Stopwatch Online
Measure elapsed time instantly with start, pause, lap and reset controls.
How to Use the Online Stopwatch
This browser stopwatch measures elapsed time and includes start, pause, lap and reset controls. It is useful for workouts, study sessions, cooking, experiments, presentations and any task where you want to track how long something takes.
Example
Start the stopwatch when a study session begins. If you reach the end of a practice section at 12:34.520, press Lap to record that point while the timer continues running.
Factors That Affect Timing
The stopwatch uses your browser’s clock and timer functions. Device sleep, heavy background activity or browser throttling can affect display updates, especially in inactive tabs. For everyday timing it is useful, but it is not intended as laboratory-grade timing equipment.
Frequently Asked Questions
Can I record lap times?
Yes. Press Lap while running or paused to add the current elapsed time to the list.
Does Pause reset the stopwatch?
No. Pause keeps the accumulated elapsed time so you can continue later.
What does Reset do?
Reset returns the display to zero and clears all recorded laps.
How the Tool Works and Its Limits
A browser stopwatch is useful for everyday elapsed-time measurement, but display refresh and background-tab throttling can differ from the underlying clock. Device sleep or browser suspension can interrupt interaction even when elapsed time is reconstructed afterward.