A snippet pipe that will calculate % based on a given pixel value and base unit.

E.g. If you want a 10px font-size expressed as a percentage, you would need to perform the following calculation (note 16px is the default base font size in all browsers):

10px / 16px = 0.625em * 100 = 62.5%

This snippet allows you to specify the desired pixel size and the base font size and will return the calculated % value.