CSS: Comparing Font Size, Percentage, Em, Point, and Pixel

A much better resource can be found here: Incremental Differences

Pixel (fixed) Point (fixed) Percent (var) Em (var) Size (var) Font Size (var) Head Size (var)
   
Arial 55%
Arial 0.55em
     
Arial 9 px
Arial 6 pt
Arial 60%
Arial 0.60em
     
Arial 10 px
Arial 7 pt
Arial 65%
Arial 0.65em
  Arial Size 1
Arial Head 6
Arial 11 px
Arial 8 pt
Arial 70%
Arial 0.70em
     
Arial 12 px
Arial 9 pt
Arial 75%
Arial 0.75em
     
   
Arial 80%
Arial 0.80em
  Arial Size 2  
Arial 13 px
Arial 10 pt
Arial 85%
Arial 0.85em
     
   
Arial 90%
Arial 0.90em
Arial x-small
 
Arial Head 5
Arial 14 px
Arial 11 pt
Arial 95%
Arial 0.95em
     
Arial 15 px
Arial 12 pt
Arial 100%
Arial 1.00em
   

Arial Head 4

Arial 16 px
Arial 13 pt
Arial 105%
Arial 1.05em
Arial small
Arial Size 3  
   
Arial 110%
Arial 1.10em
     
   
Arial 115%
Arial 1.15em
     
Arial 18 px
Arial 14 pt
Arial 120%
Arial 1.20em
Arial medium
Arial Size 4

Arial Head 3

Arial 20 px
Arial 15 pt
Arial 125%
Arial 1.25em
Arial large
Arial Size 5

Arial Head 2

 

 

Size Percentage Em Point Pixel
Arial x-small
Arial small
Arial medium
Arial large
Arial 70%
Arial 80%
Arial 90%
Arial 100%
Arial 110%
Arial 120%
Arial 0.7em
Arial 0.8em
Arial 0.9em
Arial 1em
Arial 1.1em
Arial 1.2em
Arial 7 pt
Arial 8 pt
Arial 9 pt
Arial 10 pt
Arial 11 pt
Arial 12 pt
Arial 13 pt
Arial 14 pt
Arial 7 px
Arial 8 px
Arial 9 px
Arial 10 px
Arial 11 px
Arial 12 px
Arial 13 px
Arial 14 px
Verdana x-small
Verdana small
Verdana medium
Verdana large
Verdana 70%
Verdana 80%
Verdana 90%
Verdana 100%
Verdana 110%
Verdana 120%
Verdana 0.7em
Verdana 0.8em
Verdana 0.9em
Verdana 1em
Verdana 1.1em
Verdana 1.2em
Verdana 7 pt
Verdana 8 pt
Verdana 9 pt
Verdana 10 pt
Verdana 11 pt
Verdana 12 pt
Verdana 13 pt
Verdana 14 pt
Verdana 7 px
Verdana 8 px
Verdana 9 px
Verdana 10 px
Verdana 11 px
Verdana 12 px
Verdana 13 px
Verdana 14 px
Times New Roman x-small
Times New Roman small
Times New Roman medium
Times New Roman large
Times New Roman 70%
Times New Roman 80%
Times New Roman 90%
Times New Roman 100%
Times New Roman 110%
Times New Roman 120%
Times New Roman 0.7em
Times New Roman 0.8em
Times New Roman 0.9em
Times New Roman 1em
Times New Roman 1.1em
Times New Roman 1.2em
Times 7 pt
Times 8 pt
Times 9 pt
Times 10 pt
Times 11 pt
Times 12 pt
Times 13 pt
Times 14 pt
Times 7 px
Times 8 px
Times 9 px
Times 10 px
Times 11 px
Times 12 px
Times 13 px
Times 14 px
Georgia x-small
Georgia small
Georgia medium
Georgia large
Georgia 70%
Georgia 80%
Georgia 90%
Georgia 100%
Georgia 110%
Georgia 120%
Georgia 0.7em
Georgia 0.8em
Georgia 0.9em
Georgia 1em
Georgia 1.1em
Georgia 1.2em
Georgia 7 pt
Georgia 8 pt
Georgia 9 pt
Georgia 10 pt
Georgia 11 pt
Georgia 12 pt
Georgia 13 pt
Georgia 14 pt
Georgia 7 px
Georgia 8 px
Georgia 9 px
Georgia 10 px
Georgia 11 px
Georgia 12 px
Georgia 13 px
Georgia 14 px