REM to PX Converter: CSS Units Made Simple [2025]

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Convert between REM and pixel units instantly. Perfect for responsive web design and CSS development.

✓ Real-time Conversion✓ Adjustable Base Size✓ Two-way Conversion
1 rem = 16px (base size)

Understanding REM Units

REM Basics

  • •

    Root-Based Units

    REM units are relative to the root element's font size

  • •

    Default Size

    1 REM = 16px by default in most browsers

  • •

    Scalability

    Easily scales with user preferences

Usage Benefits

  • •

    Responsive Design

    Perfect for creating scalable layouts

  • •

    Accessibility

    Respects user font size preferences

  • •

    Maintainability

    Easier to manage than pixel values

Common Use Cases

Typography

  • • Font sizes
  • • Line heights
  • • Letter spacing
  • • Text margins

Layout

  • • Margins
  • • Padding
  • • Grid gaps
  • • Container sizes

Components

  • • Button sizes
  • • Icon dimensions
  • • Border radius
  • • Spacing units

Frequently Asked Questions

Why use REM instead of pixels?

REM units provide better accessibility and scalability as they adjust based on the user's font size preferences, making your design more responsive and user-friendly.

What's the default base size?

Most browsers use 16 pixels as the default root font size, making 1rem equal to 16px. However, you can adjust this base size according to your project needs.

When should I use pixels?

Pixels are still useful for borders, small decorative elements, and when you need precise control over size regardless of user settings.

How accurate is the conversion?

Our converter provides precise calculations based on your specified base size. Results are rounded to maintain practical CSS values.

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