CSS Unit Converter

1rem

About CSS Unit Converter

CSS Unit Converter performs bidirectional conversions between CSS Pixels (px) and Root EM (rem) units with customizable base font size.

Key Capabilities & Features

✓

Bidirectional px to rem and rem to px conversion

✓

Customizable base root font size (default 16px)

✓

Includes standard CSS scale quick-reference table

How to Use CSS Unit Converter

  1. 01

    Set base font size

    Default is 16px, or adjust to match your design system.

  2. 02

    Enter value

    Type pixels or rems to get instant calculated equivalent.

100% In-Browser Privacy Guarantee

All operations in CSS Unit Converter run locally in your web browser using HTML5, Web Cryptography, and WebAssembly APIs. Your text, files, credentials, and code never leave your computer.

Frequently Asked Questions

How is rem calculated from px?

rem = pixels / baseFontSize (e.g. 24px / 16px = 1.5rem).

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