About us

A simple ruler for every screen

Right Online Ruler helps people make quick, practical measurements with the screen they already have. It is a browser-based tool for phones, tablets, laptops, desktop monitors, and LED panels.

What we provide

The tool supports centimetres, millimetres, and inches, with calibration options for common devices, screen diagonals, and standard credit cards. You can measure lines, rectangles, and angles, use the live pointer guide, and keep multiple measurements visible while working.

We focus on a clear interface that works across desktop and mobile browsers. Multiple languages, themes, touch support, and installable PWA features make the ruler useful in different environments and workflows.

Accuracy matters

A digital ruler depends on screen calibration. For important manufacturing, medical, legal, or engineering measurements, verify results with a certified physical instrument. Right Online Ruler is intended as a convenient reference and everyday measurement aid.