Absolute-length measurements

Introduction

• pt (point(s); 1 pt = 1/72 inch)
• pc (pica(s); 1 pc = 12 pt)
• mm (millimeters)
• in (inches)
• cm (centimeters)
• The relation between these units is: 1in = 2.54cm = 25.4mm = 72pt = 6pc

Relative length measurements:

• em (generally the height of a font's uppercase M)
• px (pixel but size depends on screen resolution)
• % of the font's default size