CSS Units

Convert between CSS length units — px, rem, em, pt, and % — with configurable root and parent font sizes, so you can move sizes between units without guessing.

rem is relative to the root font size; em and % are relative to the parent (context) font size. pt uses the CSS definition (1pt = 1/72in, 1px = 1/96in).

  • px 24px
  • rem 1.5rem
  • em 1.5em
  • pt 18pt
  • % 150%