wrong formula

Question

in the article we can find the relation between px and ems using following formula:
"To calculate the em size, just use the following formula: em = pixels / 16"

that formula is wrong.
1em = 16px

Answer 1

Your and their formulas are the same. Since 1em is 16px, you multiply by 16 to convert from em to px, and you divide by 16 to convert the other way.