18px to rem
At the default 16px root font size, 18px is commonly used for large body text and lead paragraphs.
18px =
1.125rem
How the conversion works
CSS unit conversions assume a default root font size of 16px (the browser default), where 1rem = 16px and 1em = 16px in a default context. Points use the CSS reference of 96dpi, so 1pt = 1.3333px. That makes 18px equal to 1.125rem.
The formula is: rem = px ÷ 16.
When to use rem
rem units are relative to the root (html) font size, so sizing fonts and spacing in rem lets the entire layout scale when a user changes their browser’s default text size. That makes rem the recommended unit for accessible, responsive typography.
Quick reference: px to rem
Convert any value between px, rem, em and pt.
Open the CSS Unit Converter