Tool
PX to REM Converter
Convert pixel values to rem for responsive CSS.
Design Tools
What this tool does
Convert pixel values to rem using a configurable root font size (default 16px).
How to use
- Enter pixel value.
- Set root font size if not 16px.
- View rem equivalent.
Formula
rem = px ÷ base font size
Examples
24px at 16px root
Input: 24 px
Output: 1.5 rem
24 ÷ 16 = 1.5 rem.
Common use cases
- Build accessible CSS
- Convert design specs to rem
- Create scalable component spacing
FAQ
Why use rem over px?
Rem scales with user font preferences for better accessibility.
What root size should I use?
16px is the browser default; match your project's html font-size.
Can I convert decimal px?
Yes. Enter values like 18.5 px.
Related tools
Last reviewed: 2026-05-23