Font Awesome Size 1.5. If you change the body font size all styles will be increased/decreased automatically. This tutorial will concentrate on the free edition.
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So, the default size of 1em is 16px.
Updated font awesome to 4.7.0; To allow users to resize the text (in the browser menu), many developers use em instead of pixels. } in the above example, the rem unit is equal to 16px (because it is inherited from the html/root element) and thus the font size for all paragraph elements will compute to 24px (1.5 x 16 = 24). So, the default size of 1em is 16px.