This extension allows you to easily convert PX to EM or REM units for your CSS for the numi calculator
Simply download the .js file to your numi extensions directory.
if the default font size is 16px the below would convert 22px to em:
pxem 22
pxrem 22
if the default font size is different then pass it in after the value to convert:
pxem 22;18
pxrem 22;18