Unit Calculator
Convert PX, PT, %, EM and REM InstantlyPX-PT-PER-REM-EM Unit Calculator
The Font Size Conversion Calculator makes it easy to convert font sizes between pixels (px), points (pt), ems (em), rems (rem), and percentages (%). The calculator uses common CSS conversion standards in which 16px equals 12pt, 1rem, or 100% when the browser’s default font size is 16px.
The em and rem values are the same, but they are calculated differently. An em value is relative to the font size of its parent element, while a rem value is relative to the root <html> element. Because these relative units depend on a base font size, you can adjust the base value when calculating sizes for your website or responsive design project.