Online Ruler


Easily measure with our Online Ruler! Switch between cm/in, add custom lines, calibrate using standard sizes, and enjoy saved sessions for seamless revisits.

Calibrate by dragging the ruler until the red lines match the width of the selected object.



Introducing our Online Ruler, a versatile and user-friendly tool for graphic designers, architects, engineers or everyone who needs a ruler. With its ability to switch between centimeters and inches, add custom lines, calibrate using standard sizes, and save sessions for later, it's an invaluable asset for accurate measurements.

Is The Ruler Accurate?

Our Online Ruler uses JavaScript to ensure precise calculations. We retrieve the pixels per inch (PPI) value from the user's device, while another function calculates the screen size in inches. Using these values, another function creates ruler markings in centimeters or inches based on the chosen unit.

When in centimeters mode, the Online Ruler creates markings at every millimeter and labels them accordingly. In inches mode, our tool marks every 1/16 inch, labeling important fractions like 1/4, 1/2, and 3/4 inches. The ruler adapts to your device's screen size, ensuring accurate measurements.

To improve the ruler's precision, our tool offers calibration using predefined standard sizes, such as a credit card or A4 paper. By dragging the ruler left or right, users can easily calibrate the tool, ensuring accurate measurements across different devices.

Other Features:

Custom lines can be added to the ruler by clicking on a specific measurement. These lines can be reset at any time, allowing users to clean the ruler for future use. This feature is particularly useful for comparing measurements or marking multiple dimensions simultaneously, making the Online Ruler even more versatile and convenient.

One of the most valuable aspects of our Online Ruler is its ability to store user sessions. By leveraging local storage, the tool automatically saves the user's preferences, custom lines, and calibration settings. This means that when users return to the website, they'll find the ruler exactly as they left it, eliminating the need for constant readjustments.

In summary, our Online Ruler is a powerful, easy-to-use, and accurate measurement tool for your website. With options to switch between centimeters and inches, add custom lines, calibrate with standard sizes, and save user sessions, it's an indispensable resource for a wide range of applications.



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