The tool below allows you to work out the em sizes from pixels (or vice versa). size in pixels (px) to display a complete "px to em and percent" conversion table. For those new to em values, The Mozilla Developer Network does an excellent job of There are a variety of ways to calculate ems with Sass. For those new to em values, The Mozilla Developer Network does an excellent job of There are a variety of ways to calculate ems with Sass. As a solution, I found this revised version of the function fixes it: Home Worth A Look CSS Network E-Books. This will set font-size to 10px without explicitly setting it to 10px. The character size depend of the dpi of the used display. CSS Learn Colors Learn Bootstrap Learn Graphics Learn Icons Learn How To. The way you get that value is by dividing the absolute line height number by the font size number. This is very useful stuff, and in my mind every developer building responsive websites should pick this up The game online. Thanks for this helps a lot with the process, instead of having to use calculator back and forth! Carpe di-em Sick of the puns yet? Additionally, end-users can igt slots games hot keys to scale the text in all browsers. Your message has been sent to W3Schools. Please use a real name or alias. It also cascades in the same way, so the very problem described above of the list item and the paragraph item applies here as well. Did you find this question interesting? According to the W3C an em: By the way, you missed a word here: Your message has been sent to W3Schools. For good measure, the reason we don't use point sizes for screen display other than it being absurd , is that the cross-browser results are drastically different:. But if you are doing that kind of thing you are probably well aware and can deal with it. Although points can be used on screen, they are the standard in printing because they are a factor of DPI. Link to the em calculator in the comments is invaluable, never run across that before! You'll never look back! In other words, ems don't have an absolute size.