Px to Rem Converter
Convert between pixels and rem units for responsive CSS design.
Px to Rem Converter
Convert between pixels and rem units for responsive CSS
PXREM
FAQ
What is the difference between px, rem, and em?
px (pixels) is a fixed unit. rem is relative to the root (html) font size. em is relative to the parent element's font size. rem is preferred for consistent scaling across the site.
What should my base font size be?
The browser default is 16px, which is the most common base. Some developers use 10px for easier math (1rem = 10px), set via html { font-size: 62.5%; }.
Why use rem instead of px?
rem units scale with user preferences for text size (accessibility), enable global scaling by changing the root font size, and make responsive design easier.
How do I set the base font size in CSS?
Set it on the html element: html { font-size: 16px; } or use a percentage like html { font-size: 100%; } to respect user preferences.