High-Precision Digital Chronometer

Our free digital chronometer provides millisecond precision with lap timing and data export. Perfect for sports timing, scientific measurements, workout tracking, competitions, or any activity requiring precise timing. This stopwatch tool features easy-to-use controls, split time recording, and keyboard shortcuts. Our online chronometer works on all devices with no installation required.

00:00:00.000

Ready to start

Lap Times

Lap	Lap Time	Total Time

Chronometer Options

Show Milliseconds

Dark Mode Keep Screen Awake

Notes:

Press Spacebar to start/pause the chronometer
Press L to record a lap time
Press R to reset the chronometer
The chronometer continues running even when switching to other tabs or applications
Your timing sessions are automatically saved if you leave the page
For extended timing sessions, consider using a persistent power source for your device

Complete Guide to Digital Chronometers

What is a Chronometer?

A chronometer is a high-precision timing instrument designed for accurate time measurement. Unlike basic stopwatches, chronometers are known for their exceptional accuracy and reliability. Historically, the term "chronometer" referred to marine navigation instruments that needed to maintain extreme precision regardless of environmental conditions. Today, digital chronometers maintain this tradition of precision while adding modern features like millisecond accuracy, lap timing, and data export capabilities.

Modern digital chronometers serve as invaluable tools in scenarios where precise time measurement is critical. From athletic performance analysis to scientific experimentation, industrial process timing to competitive events, these versatile instruments help capture exact durations with minimal error.

Common Use Cases for Digital Chronometers:

Sports performance measurement and athletic training
Scientific experiments requiring precise timing
Interval training and workout management
Professional race timing and competitions
Industrial process timing and quality control
Performance benchmarking in computing
Educational demonstration of time-dependent concepts
Medical diagnostic procedures requiring exact durations

Frequently Asked Questions

How accurate is this online chronometer?

Our digital chronometer provides millisecond precision (1/1000th of a second) and uses your device's high-resolution timer for accurate measurements. While not certified for official timing, it delivers exceptional accuracy for most timing needs. For absolute precision-critical applications, dedicated hardware chronometers may be preferable.

How do I use the lap timing feature?

Once you've started the chronometer by clicking the "Start" button or pressing the spacebar, you can record lap times by clicking the "Lap" button or pressing the "L" key on your keyboard. Each lap records both the individual lap time (time since the last lap) and the total elapsed time. These times will appear in the lap times table and can be exported for analysis.

Will the chronometer continue running if I switch tabs?

Yes, our chronometer continues running even when you switch to other tabs or applications. The timing mechanism uses your device's system clock rather than active counting, ensuring accurate timing regardless of whether the tab is in focus. When you return to the chronometer tab, it will display the correct elapsed time. Your timing data is also preserved if you accidentally close the page or refresh.

How do I export my lap times?

To export your recorded lap times, click the "Export Data" button above the lap times table. This will generate a CSV (comma-separated values) file containing all your recorded lap data, which you can download and open in spreadsheet applications like Microsoft Excel, Google Sheets, or other data analysis tools. This feature is particularly useful for coaches, scientists, or anyone analyzing performance data.

What's the difference between a chronometer and a regular stopwatch?

While both measure elapsed time, chronometers are distinguished by their higher precision and accuracy. Traditional chronometers undergo rigorous testing and certification to ensure they maintain accuracy under various conditions. Our digital chronometer follows this tradition by offering millisecond precision, reliable operation across devices, and advanced features like lap timing and data export that exceed basic stopwatch functionality.

What does the "Keep Screen Awake" option do?

The "Keep Screen Awake" option prevents your device from going into sleep mode while the chronometer is running. This is particularly useful for longer timing sessions where you need to see the display continuously without touching the screen. When enabled, it uses the Wake Lock API (on supported browsers) to keep your screen active. This feature is especially helpful for sports timing, experiments, or when your device is not being actively used but you still need to monitor the elapsed time.

Are my timing sessions saved between visits?

Yes, your active timing session is automatically saved in your browser's local storage. If you accidentally close the page or navigate away during timing, your elapsed time will be restored when you return to the chronometer. This feature ensures you don't lose timing data due to browser refreshes or accidental navigation. To start a completely fresh timing session, simply use the Reset button.

Can I use this chronometer on mobile devices?

Absolutely! Our chronometer is fully responsive and works on all devices including smartphones and tablets. The interface automatically adjusts to your screen size for optimal viewing and interaction. On mobile devices, you may want to enable the "Keep Screen Awake" option to prevent your phone from going to sleep during timing sessions. For the best experience on mobile, consider adding the chronometer to your home screen for quick access.

High-Precision Online Chronometer