To convert 10 rem (root em) to pixels (px), you'll need to know the base font size of the document or the element you're working with. The rem unit is relative to the font-size of the root element, which is typically the <html> element.
To convert 10 rem to pixels use this formula: 10 rem × font size in pixels = Pixels
base value:
Value(rem):
Value(Pixels):