REM to Percentage Converter

Convert rem units to percentage (%) instantly for responsive web design

About REM to Percentage Conversion

This tool converts REM units (relative to root font size) to percentage units (relative to parent element size). Both are relative units but work differently in CSS layouts.

How to Use This Tool

  1. Enter the REM value you want to convert
  2. Specify the root font size in pixels (default is 16px)
  3. Specify the parent element size in pixels (default is 100px)
  4. Click "Convert to Percentage" to get the equivalent % value
  5. Copy the result and use it in your CSS

The Conversion Formula

The formula to convert REM to percentage is:

percentage = (rem × root-font-size) / parent-size × 100%

For example, to convert 1.5rem to percentage when root is 16px and parent is 200px:

(1.5 × 16) / 200 × 100% = 12%

Why Convert REM to Percentage?

Key Differences Between REM and Percentage

Best Practices