PX to REM Converter

How it works

In CSS, a rem is a multiple of the root font size. With the browser default of 16 px, 24 px equals 1.5 rem and 16 px equals exactly 1 rem. This converter divides your pixel value by the base you set. The reason to prefer rem is accessibility. A user who raises their browser's default font size expects the whole interface to scale with it — that happens automatically with rem, while a layout hard-coded in pixels stays stubbornly small and can become unusable. The difference with em is the reference point: em is relative to the *parent* element's font size, so nested elements compound (an em inside an em inside an em shrinks unpredictably), while rem always refers to the root and stays predictable. Common practice: rem for spacing and typography, em for properties that should follow their own element's size, like padding on a button.