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.

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.

via CSS Font Size Conversion Chart.