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CSS Font Size Conversion Chart

July 20th, 2009


Here is a chart that will help you find the conversion of pt,px,ems and %. The chart is good for an approximation, font size can change based on font, and operating system.

Points Pixels Ems Percent
6pt 8px 0.5em 50%
7pt 9px 0.55em 55%
7.5pt 10px 0.625em 62.5%
8pt 11px 0.7em 70%
9pt 12px 0.75em 75%
10pt 13px 0.8em 80%
10.5pt 14px 0.875em 87.5%
11pt 15px 0.95em 95%
12pt 16px 1em 100%
13pt 17px 1.05em 105%
13.5pt 18px 1.125em 112.5%
14pt 19px 1.2em 120%
14.5pt 20px 1.25em 125%
15pt 21px 1.3em 130%
16pt 22px 1.4em 140%
17pt 23px 1.45em 145%
18pt 24px 1.5em 150%
20pt 26px 1.6em 160%
22pt 29px 1.8em 180%
24pt 32px 2em 200%
26pt 35px 2.2em 220%
27pt 36px 2.25em 225%
28pt 37px 2.3em 230%
29pt 38px 2.35em 235%
30pt 40px 2.45em 245%
32pt 42px 2.55em 255%
34pt 45px 2.75em 275%
36pt 48px 3em 300%

 

For those of you who are still using pixels, it’s about time you made the switch to ems or points.  It allows users who have a hard time reading small type to enlarge the font.  Here is a little trick that will help you so you don’t have to remember the chart above.

1
body { font-size: 62.5% }

This will make 1.0 em the same as 10px.  So if you wanted 12 px. would be 1.2em, nice and easy.  Hopefully this will help you out, I know I use it all the time.  Enjoy.

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