PX ↔ REM Converter

Base Size (Root Font Size) px

Pixels (px)

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REM

What is a PX to REM converter and why is it important?

A PX to REM converter is a fundamental tool for frontend developers and web designers looking to create modern and accessible websites. While pixels (PX) are absolute and fixed units of measurement, REM units are relative to the root element's font size (usually HTML).

Using a calculator for CSS units allows you to transition from a static to a fluid design, ensuring that spacing and typography adapt correctly to user preferences and different devices.

How to correctly convert Pixels to REM

To perform the conversion manually, the browser's base font size is taken as a reference, which by default is usually 16 pixels. The mathematical formula is as follows:

Formula: REM Value = Pixel Value / Base Font Size (Root).
Example: If you want to convert 32px with a 16px base, the result will be 2rem (32 / 16 = 2).

Advantages of using REM units in your CSS code

Implementing relative units instead of fixed values offers multiple strategic benefits for your page's SEO and usability:

Web Accessibility: Allows users with vision problems who increase the font size in their browser to see a scaled and readable design.
Simplified Responsive Design: By changing the base font size in a media query, the entire REM-based design will automatically adjust proportionally.
Visual Consistency: Facilitates maintaining exact proportions between different interface elements.

Common PX to REM Equivalences (16px Base)

If you work with the standard 16px setting, these are some of the most commonly used measurements in web development:

8px is equivalent to 0.5rem.
12px is equivalent to 0.75rem.
16px is equivalent to 1rem.
24px is equivalent to 1.5rem.
32px is equivalent to 2rem.
64px is equivalent to 4rem.

Editorial Team | Utilidades.io

We develop practical and free tools for everyday use.