About PX to REM Conversion
REM (Root EM) units in CSS are relative to the root element's font size, making them ideal for responsive design. Unlike pixels (px) which are fixed units, REM units scale with the user's preferred browser settings.
How to Use This Tool
- Enter the pixel value you want to convert
- Specify your base font size (default is 16px)
- Click "Convert to REM" to get the equivalent REM value
- Copy the result and use it in your CSS
The Conversion Formula
The formula to convert pixels to rem is simple:
rem = px / base-font-size
For example, if your base font size is 16px and you want to convert 24px to rem:
24px / 16px = 1.5rem
Why Use REM Units?
- Accessibility: REM units respect user's browser font size preferences
- Responsiveness: Easier to create scalable layouts that adapt to different screen sizes
- Maintainability: Change the root font size to adjust your entire layout proportionally
- Consistency: Relative units prevent compounding issues with nested elements
Best Practices
- Set your base font size in pixels on the HTML (root) element
- Use REM units for font sizes, margins, paddings, and other spacing
- Use EM units for properties that should scale with their immediate parent
- Consider using a CSS preprocessor to create px-to-rem functions for easier development