Relative Length Units
em "M" The size of the "M" glyph
ex "x" The size of the "x" glyph
% percent Percent of allotted space
px pixels The size of a screen pixel
Absolute Length Units
in inches 1 inch = 2.54 centimeters
cm centimeters 1 inch = 2.54 centimeters
mm millimeters 1 centimeter = 10 millimeters
pt points 1 inch = 72 points
pc picas 1 inch = 6 picas
Unit Conversion
in
cm
mm
pt
pc
 Convert Units
Convert Units 		in
cm
mm
pt
pc
  px
 96/in px
  
  px
 72/in px
  
Typical Screen Dimensions
800px
×
600px
1024px
×
768px
1280px
×
1024px
1152px
×
864px
1280px
×
768px
1440px
×
900px
1600px
×
1200px
640px
×
480px