Pixels, EMs, Percent, Points. 6px, em, %, 5pt. 7px, em, %, 5pt. 8px, em, %, 6pt. 9px, em, %, 7pt. 10px, em, %. Pixels, EMs *, Percents *, Points. 6px, em, %, 5pt. 7px, em, %, 5pt. 8px, em, 50%, 6pt. 9px, em, %, 7pt. In the table below, select a body font size in pixels (px) to display a complete "px to em and percent " conversion table. Tip: The default font size is usually 16px. Hopefully people know enough to look at the time stamps on answers and take that into consideration. I was just answering the OPs question. As for being able to scale the font… I do not want this. Although points can be used on screen, they are the standard in printing because they are a factor of DPI. Reproduction of materials found on this site, in any form, without explicit permission is prohibited. December 14, at I leave windows on it and run a multiple ie program: EM is a relative measurement. Web Design Sussex says: Really clear explanation of the various techniques, btw — the em explanation in particular helped me understand why a design kept breaking on me a while back. When SASS introduced functions in v3. Font Size finds its use in number of places right from education to industrial usage.