I don't know what monitor size is.

Free online ruler for accurate measuring in inches, centimeters, and millimeters. Use our real size digital ruler on any phone, tablet, or computer.

Online Ruler will help you to take actual size measurements of any object in mm, cm, and inches. Also, it's free and easy to use.

Use our online actual size ruler to accurately measure objects in both centimeters and inches. Print-ready and calibrated for your screen.

Measure in cm, inches, or mm with this accurate online ruler. A real-size, printable tool for desktop or phone that works vertically or horizontally.

An online screen ruler tool for accurate on-screen measurements. Measure in actual size using centimeters, millimeters, inches, or pixels.

Accurate and free online ruler in cm and inches. Auto-calibrated digital screen ruler for precise measurement on any device. Try our virtual measuring tool now.

Need to measure something quickly and accurately? Use our cm ruler right from your browser. This handy online ruler is designed for easy use on any screen—just ensure your display settings are …

Free online ruler tool for measuring inches (in), centimeters (cm) and millimeters (mm)! The ruler scales to actual size based on your screen size. Every device has a different pixel density, so we auto …

Looking for an online ruler that’s actually true to size? Our virtual ruler lets you measure in millimeters (mm), centimeters (cm), and inches, all in a 1:1 scale.