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Pixel to REM Converter
Convert pixels to REM/EM units and vice versa. Essential for responsive and accessible web development.
Default browser font size is usually 16px.
Quick Reference (Base 16px)
💡 Why use REM?
REM (Root EM) units are relative to the root HTML element. Using them ensures your website respects the user's browser font size settings, making your site more **accessible** and easier to scale responsively.
How to use this tool
Follow these steps to get the most out of the Pixel to REM Converter.
Enter the base font size (default is 16px).
Type a value in pixels to see the REM equivalent.
Or type in REM to see the pixel value.
Copy the result to your CSS.
The guide
Pixels vs. REM: Which should you use?
In modern web development, REM (Root EM) is generally preferred over pixels for font sizes, spacing, and layout elements.
The Accessibility Argument
When you define sizes in pixels (e.g., font-size: 16px), you are hard-coding that value. If a user with visual impairments sets their browser’s base font size to 24px, your website will ignore their preference and force 16px, making text hard to read.
Using REM (e.g., font-size: 1rem), your layout scales relatively. 1rem equals “100% of the root font size”. If the user wants bigger text, your entire site scales up proportionally.
The Math
The formula is simple:
REM = Pixels / Base Size
Pixels = REM * Base Size
Most browsers have a default base size of 16px.
- 16px = 1rem
- 24px = 1.5rem
- 32px = 2rem
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