What Is Online Ruler?
Have you ever needed to measure something but didn’t have a physical ruler handy? Our online ruler is the perfect solution! This virtual tool allows you to measure small objects accurately in either inches or centimeters directly on your screen. Whether you're on a desktop computer, tablet, smartphone, or even a smart TV, you can quickly get precise measurements without any extra tools.
Is The Ruler Accurate?
Yes! Our online ruler is designed to provide the most accurate measurements possible. However, the precision depends on factors such as your device's screen size, pixel density (PPI), and your browser's privacy settings. To ensure perfect accuracy, we offer an easy calibration feature so you can tailor the ruler to your specific screen.
How to Use This Online Ruler?
We made our online ruler extremely user-friendly right from the start. Follow these simple steps to start measuring:
- Choose your preferred unit of measurement—centimeters or inches—in the settings menu. The default is centimeters.
- Select the ruler orientation: horizontal or vertical, depending on what you want to measure.
- Place the object you want to measure against your screen and read the measurement directly from the ruler.
How to Calibrate Our Online Ruler?
We automatically detect your screen size and calculate the pixel density (PPI) to adjust the ruler. Sometimes this automatic detection may not be perfect due to device or browser limitations. You can manually calibrate the ruler by entering your screen size or PPI in the settings. For assistance, feel free to use our PPI Calculator to find the exact pixel density of your device for optimal accuracy.
How to Use My Phone as a Ruler?
Turn your smartphone into a convenient measuring tool anytime, anywhere by following these steps:
- Open the online ruler app on your mobile phone’s browser.
- Set your preferred units (inches or centimeters) and orientation using the settings button.
- Calibrate the ruler if necessary, using the calibration options explained above.
- Place the object along your phone’s screen edge and take accurate measurements on the go.
This easy-to-use web app transforms your phone into a portable, reliable ruler — no physical measuring tools required.
Why Use an Online Ruler?
An online ruler offers unmatched convenience. Whether you're crafting, shopping online, or just curious about the size of something around you, this tool lets you measure instantly without searching for a physical ruler. It works across devices and eliminates the need for extra apps or downloads, making it accessible wherever you are.
Tips for Best Results
To get the most precise measurements:
- Always calibrate the ruler when using a new device or screen.
- Use the ruler in a well-lit environment for better visibility.
- Keep your browser zoom set to 100% for accurate scale representation.
Supported Devices
Our online ruler works flawlessly on a wide range of devices, including:
- Desktop and laptop computers (Windows, macOS, Linux)
- Tablets (iPad, Android tablets)
- Smartphones (iPhone, Android phones)
- Smart TVs and other internet-enabled screens
No matter your device, you can rely on our tool for quick and easy measurements anytime.