How to convert pixels to cm in JavaScript

Question

I'm writing CSS for project and need to convert pixel to centimeter with JavaScript. how do I calculate this conversion?

Answer 1

You could use window.devicePixelRatio to check for device caps. It is used in most browsers.

Answer 2

There are 2.54 centimeters per inch; if it is sufficient to assume 96 pixels per inch, the formula is rather simple:

centimeters = pixels * 2.54 / 96

There is a way to get the configured pixels per inch of your display for Microsoft Windows called GetDeviceCaps. Microsoft has a guide called "Developing DPI-Aware Applications", look for the section "Creating DPI-Aware Fonts".

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