Developer Tools · Free Tool
CSS Unit Converter
Convert a value between px, rem, em, pt, pc, in, cm and mm at once — with configurable root and parent font sizes for the relative units. Computed live in your browser.
Value
Unit
Root font-size (px)
Parent font-size (px, for em)
How it works
Your value is converted to absolute pixels and then out to every unit, using the CSS-standard ratios: 1in = 96px, 1pc = 16px, 1pt = 1/72in, and 1cm = 96/2.54px. Relative units depend on font size — rem uses the root size and em uses the parent size you set. Everything is computed live in your browser.