Web Dev Tools

Pixels to REM Converter

Convert pixels (px) to REM units and vice versa for responsive web design. Customize base root font size (default 16px).

Use Pixels to REM Converter to get instant results without uploads or sign-ups. Everything runs securely in your browser for fast, reliable output.

Your results will appear here.

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About this tool

In modern web design, using relative units like REM (Root EM) is preferred over absolute pixels (PX) for accessibility and responsiveness. REM units scale automatically if the user changes their browser text size settings.

This converter helps you translate your design file (usually in pixels) into code-ready REM values based on your project's root font size.

Usage examples

Standard Convert

16px Base

32px → 2rem

Small Text

14px

14px → 0.875rem

How to use

  1. Enter your "Base Size" (usually 16px).
  2. Enter the value you want to convert.
  3. Switch between "PX to REM" or "REM to PX" mode.
  4. Copy the result for your CSS.

Benefits

  • Bidirectional conversion
  • Custom base size support
  • Copy to clipboard
  • High precision results

FAQs

Why use REM instead of PX?

REM units allow users to scale the website text size using their browser settings. Pixels are fixed size and can create accessibility issues.

What is the default base font size?

Most browsers use 16px as the default root font size. This means 1rem = 16px by default, but users can change this in their browser settings.

How do I convert pixels to REM?

Divide the pixel value by the root font size (usually 16). For example, 24px ÷ 16 = 1.5rem.

Should I use REM or EM?

REM is relative to the root element, while EM is relative to the parent element. REM is generally easier to maintain and prevents compounding size issues.

When should I still use pixels instead of REM?

Use pixels for fixed-size elements that shouldn't scale with text size: borders (1px borders), box shadows, small icons, and precise decorative elements. For typography, spacing, and layout dimensions, REM is preferred for accessibility and responsive design.

What if my design uses 10px as base instead of 16px?

Some developers set html { font-size: 62.5%; } to make 1rem = 10px (62.5% of 16px), making mental math easier. Our calculator supports custom base sizes - just enter 10 as your base. However, this approach can cause accessibility issues since it overrides user preferences, so many developers now avoid it.

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