How accurate is this online stopwatch?

Our online stopwatch is accurate to centiseconds (1/100th of a second) and updates every 10 milliseconds for smooth display. It uses JavaScript's high-precision timing for reliable results.

Can I record lap times with this stopwatch?

Yes! Click the Lap button while the stopwatch is running to record split times. You can record unlimited laps, and each lap shows both the total time and the split time from the previous lap.

Does the stopwatch work offline?

Yes, once the page loads, the stopwatch works offline. The timing function runs locally in your browser and doesn't require an internet connection to continue working.

Can I use keyboard shortcuts with the stopwatch?

The stopwatch supports the Escape key to exit fullscreen mode. For other controls, use the on-screen buttons for Start, Pause, Lap, and Reset functions.

Is this stopwatch suitable for sports timing?

Yes, this stopwatch is perfect for sports timing, workouts, HIIT training, running intervals, swimming laps, and any activity requiring precise time measurement with lap recording capabilities.

Does the stopwatch continue running in background tabs?

Yes, the stopwatch continues running when you switch tabs or minimize the browser window, though some browsers may slow down background tabs to save battery on mobile devices.

Online Stopwatch Timer

Free Digital Stopwatch with Precision Timing & Lap Function

Accurate stopwatch timer for workouts, HIIT training, sports, study sessions, cooking, and productivity. Features lap recording, fullscreen mode, and mobile-friendly design.

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How to use the stopwatch: Click Start to begin precision timing. Use Lap to record split times during workouts, training, or intervals. Pause to temporarily stop, or Reset to clear all times. Go fullscreen for presentations, gyms, or distraction-free timing sessions.

10s 15s 30s 45s 1 min 2 min 3 min 5 min 10 min 15 min 20 min 30 min 60 min Custom Stopwatch

Professional Online Stopwatch Timer

Our online stopwatch timer is a precision digital timing tool designed for athletes, fitness enthusiasts, students, professionals, and anyone needing accurate time measurement. This free stopwatch features centisecond precision, lap recording, and fullscreen capabilities for optimal usability across all devices.

Key Features of Our Digital Stopwatch

Precision Timing: Accurate to 1/100th of a second (centiseconds) with smooth 10ms display updates
Lap Time Recording: Unlimited lap splits with individual and cumulative timing display
Fullscreen Mode: Distraction-free large display perfect for presentations, classrooms, and gyms
Mobile Responsive: Optimized for phones, tablets, and desktop computers
Offline Capability: Works without internet connection once loaded
Zero Cost: Completely free with no registration, downloads, or ads
Browser-Based: No app installation required - works in any modern web browser
Background Operation: Continues timing when switching tabs or minimizing window

Perfect Applications for Stopwatch Timing

Fitness & Sports Training

HIIT Workouts: High-intensity interval training with precise rest periods
Tabata Training: 20-second work, 10-second rest interval timing
Running Intervals: Track sprint intervals and recovery times
Swimming Laps: Record individual lap times and total workout duration
Circuit Training: Time exercise stations and transition periods
Sports Coaching: Practice drills, scrimmage timing, and performance measurement

Academic & Professional Use

Study Sessions: Pomodoro technique timing and focus periods
Presentations: Practice timing and live presentation monitoring
Meetings: Agenda item timing and discussion periods
Examinations: Test sections and student activity timing
Laboratory Work: Experiment timing and reaction monitoring
Cooking & Baking: Precise timing for recipes and cooking processes

How to Use the Online Stopwatch

Start Timing: Click the green "Start" button to begin the stopwatch
Record Laps: Press "Lap" during timing to record split times without stopping
Pause/Resume: Use "Pause" to temporarily stop, then "Start" to continue
Reset Timer: Click "Reset" to return to 00:00.00 and clear all lap times
Fullscreen Mode: Click the fullscreen icon for large, distraction-free display
Exit Fullscreen: Press Escape key or click the × button to return to normal view

Why Choose Our Stopwatch Over Apps?

No Installation: Instant access without downloading or installing apps
Universal Compatibility: Works on iOS, Android, Windows, Mac, and Linux
Always Updated: Automatic updates with new features and improvements
Privacy Focused: No data collection, tracking, or personal information required
Storage Efficient: No device storage space required
Cross-Platform: Same experience across all devices and browsers

Technical Specifications

Timing Accuracy: ±10 milliseconds (browser dependent)
Display Precision: Centiseconds (0.01 second increments)
Maximum Duration: Unlimited (tested beyond 24 hours)
Lap Recording: Unlimited number of laps
Browser Support: Chrome, Firefox, Safari, Edge (latest versions)
Device Support: Desktop, tablet, smartphone

Frequently Asked Questions

Our online stopwatch is accurate to within ±10 milliseconds, which is comparable to most digital stopwatches and suitable for all general timing needs. The accuracy depends on your browser's JavaScript engine, but it's precise enough for sports, fitness, cooking, and professional applications.

While our stopwatch is highly accurate for training and practice, official competitive events typically require certified timing equipment. However, it's perfect for coaching, training sessions, school sports, recreational competitions, and personal fitness tracking.

If you close the browser tab, the stopwatch will stop and lose all timing data. For important timing sessions, we recommend keeping the tab open and using the pause function instead of closing the browser.

The stopwatch is optimized for minimal battery usage. The display updates every 10 milliseconds only when visible, and the timing calculation is very lightweight. Battery drain is negligible compared to video streaming or gaming apps.

Currently, lap times are displayed on screen and can be manually recorded or screenshot. Future updates may include export functionality for saving lap times to files or sharing results.

Related Timer Tools

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Interval Timers

Perfect for HIIT, Tabata, circuit training, and any workout requiring alternating periods.

5 Minute Timer

Pomodoro Timer

25-minute focused work sessions with 5-minute breaks for enhanced productivity.

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References: For more information about timing accuracy and precision in digital systems, see MDN Performance.now() documentation and Stopwatch principles on Wikipedia.