How to Use This PX to REM Converter

Our calculator instantly converts between CSS pixels (px) and relative REM units. Simply enter a value in either field to see the conversion. The calculation is based on the standard root font-size of 16px, where 1rem = 16px (1px = 0.0625rem).

Why Use REM Units in CSS?

REM (Root EM) units are relative to the root HTML element's font-size, making them perfect for responsive, accessible web design:

• Better accessibility - respects user's browser font-size preferences
• Easier responsive scaling - change root size to adjust all elements
• More consistent than EM units - not affected by parent element sizes
• Modern best practice - recommended for responsive layouts

EM vs REM: Key Differences

While both are relative units, EM is relative to the parent element's font-size, creating compounding issues in nested elements. REM is always relative to the root (html) font-size, providing consistent sizing throughout your document.

Common Use Cases

Use REM units for: font sizes, margins, paddings, and any spacing that should scale with the root font-size. Use PX for: borders, shadows, and other design elements that need precise pixel-perfect control.

🔗 Related Tools You Might Like

• 📎 JSON Formatter & Fixer – Beautify and repair JSON
• 🆔 UUID Generator – Generate unique identifiers
• 🔐 Base64 Encoder & Decoder – Encode/Decode secure strings