Online Tool: px-pt-per-rem Unit Calculator

Using this Font Size Conversion Calculator allows you to easily convert font sizes between pixels (px), points (pt), ems/rems, and percent (%) values. This online tool uses the following formulas and standard base values: 12pt is often equivalent to 16px (1rem or 100%), and an em is relative to the parent element's font size while rem is relative to the root element's font size.