PX to REM Converter
Real-time bidirectional px/rem converter with customizable base font sizes (14px, 16px, 18px). Includes comprehensive reference table for common spacing values.
Base:
Pixels (px)
px
REM
rem
Common Conversions
Base font size: 16px
Why Use REM?
REM (root em) units are relative to the root element's font size, making them ideal for building responsive, accessible designs. Unlike pixels, rem values scale when users change their browser's default font size, improving readability for all users.
The Formula
The conversion is straightforward: rem = px / base and px = rem * base. The default base font size in browsers is 16px, but you can adjust this in your CSS withhtml { font-size: ... }.