Free Online Stopwatch
Measure elapsed time with precision. Use the stopwatch for sports, cooking, studying, or any activity that needs accurate timing.
Lap times
How to Use the Online Stopwatch
Click Start to begin timing. The stopwatch counts upward with millisecond precision. Use the Lap button to record split times without stopping the clock — useful for tracking intervals in workouts, races, or experiments. Hit Stop to pause, then Resume to continue or Reset to start fresh.
Stopwatch vs. Timer
The stopwatch measures elapsed time by counting up — you use it when you don't know in advance how long something will take. The online timer counts down from a set duration and alerts you when it reaches zero. To be reminded at a specific clock time, use the alarm clock.
Need to see your current time or timezone? Check the current time page or compare times across cities with the world clock.
Popular Stopwatch Uses
Sports Timing
Time running laps, swimming splits, or cycling intervals. Record each lap to track your progress.
Speed Cubing
Measure your Rubik's cube solve time with millisecond precision. Track your personal best.
Science Experiments
Accurately measure reaction times, chemical processes, or any experiment requiring precise time tracking.
Frequently Asked Questions
How accurate is the online stopwatch?
The stopwatch uses your browser's high-resolution timer, providing millisecond-level accuracy.
Can I record lap times?
Yes. Click the Lap button while the stopwatch is running to record split times.
What is the difference between the stopwatch and the timer?
The stopwatch counts up to measure elapsed time. The timer counts down from a set duration and alerts you when it reaches zero. Use the stopwatch when you want to measure how long something takes.
Can I set an alarm to go off at a specific time?
The stopwatch doesn't support alarms. For that, use the online alarm clock to set an alert for a specific time, or the timer for a countdown.