CSS font size conversion

by Darrell Kingsley — last modified Mar 13, 2014 02:15 PM
Here's a table of approximate conversions between different font size measures
PointsPixelsEmsPercent
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%

 

This comes from Reed Design here http://reeddesign.co.uk/test/points-pixels.html, so thanks to them. The site was slow when I visited, so here's another copy of their useful info.

While we're at it, here are some other useful pages I found on the subject:

http://clagnut.com/blog/348/

http://social.expression.microsoft.com/Forums/en/web/thread/f8aa8e2a-91b9-4836-86c5-d5d6f0dcc1b1

http://www.alistapart.com/articles/howtosizetextincss/