Typography uses different units depending on medium. Points and picas come from print traditions, while pixels dominate digital interfaces and CSS layouts.

Point (pt)

In the PostScript system, 1 point equals 1/72 inch. Font sizes in print are still commonly specified in points, such as 10 pt, 11 pt, or 12 pt body text.

Pica (pc)

A pica is mainly used for layout dimensions like column widths and baseline grids. 1 pica equals 12 points (1/6 inch). Editorial and magazine workflows often use picas for quick proportional page planning.

Pixel (px)

On the web, px usually means a CSS pixel, a logical unit rather than always a single physical pixel. On high-density displays, one CSS pixel may map to multiple hardware pixels.

  • 1 in = 72 pt
  • 1 pc = 12 pt
  • CSS px is device-independent in practice

In real projects, print layouts remain point/pica-centric, while digital products rely on px/rem systems. Understanding the conversion context helps maintain consistent typography across PDF, web, and mobile outputs.