Stopwatch
A precise stopwatch with lap timing functionality, perfect for tracking sports, workouts, and timed activities.
00:00:00.00
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About This Stopwatch
How It Works
- High-precision timing with millisecond accuracy
- Start, stop, and reset controls for easy operation
- Lap recording to track split times during activities
- Automatic fastest/slowest lap detection
- Fullscreen mode for better visibility
Common Use Cases
- Sports training and performance tracking
- Interval workouts and fitness timing
- Presentation and speech timing
- Cooking and recipe timing
- Scientific experiments and measurements
- Gaming and speedrun timing
Frequently Asked Questions
What is this stopwatch tool used for?
This online stopwatch is a precision timing tool that measures elapsed time with millisecond accuracy. It's perfect for sports training, workouts, timing presentations, cooking, scientific experiments, or any activity where you need to track precise time intervals.
How accurate is the stopwatch timing?
The stopwatch provides millisecond precision (displayed as HH:MM:SS.MS format) using advanced browser timing APIs. It uses requestAnimationFrame for smooth, accurate timing that's synchronized with your browser's refresh rate for maximum precision.
How do I use the lap timing feature?
Start the stopwatch and click the "Lap" button whenever you want to record a split time. The tool will record the timestamp and display all your laps in a table, showing both the total elapsed time and the time for each individual lap.
What are the fastest and slowest lap indicators?
The stopwatch automatically analyzes your recorded laps and highlights the fastest lap in green and the slowest lap in red. This helps you quickly identify your best and worst performance segments during training or timing activities.
How does the fullscreen mode work?
Click the "Fullscreen" button to display the stopwatch in fullscreen mode with a larger timer display. This is perfect for presentations, classroom activities, or when you need better visibility from a distance. Press the button again or use the Escape key to exit fullscreen.
Does the stopwatch continue running if I switch browser tabs?
Yes, the stopwatch continues tracking time accurately even when the browser tab is inactive or minimized. The tool uses high-resolution timestamps to maintain precision regardless of tab visibility.
Can I use this stopwatch on mobile devices?
Absolutely! The stopwatch is fully responsive and works perfectly on smartphones and tablets. The touch-friendly interface makes it easy to start, stop, and record laps on mobile devices.
How do I reset the stopwatch?
Click the "Reset" button to clear the timer and return to 00:00:00.00. This will also clear all recorded laps, giving you a fresh start for your next timing session.
Is there a limit to how many laps I can record?
There's no practical limit to the number of laps you can record. The lap table will display all your recorded times with automatic scrolling if you have many laps. Each lap shows the cumulative time and individual lap duration.
Does this tool require an internet connection or account?
No, the stopwatch works entirely in your browser without requiring an internet connection once loaded. No account registration or login is needed - it's completely free and private.
Can I copy the lap times for use elsewhere?
While the tool doesn't have a built-in copy feature, you can manually copy the lap times displayed in the table. The times are shown in a clear, readable format that's easy to transcribe or screenshot.
What sports or activities is this stopwatch best for?
This stopwatch is ideal for any activity requiring precise timing: track and field events, swimming laps, interval training, cycling splits, running segments, reaction time testing, cooking timers, presentation timing, and scientific experiments.