jQuery.px

Measure CSS units in pixels.

Reference: 1em within different contexts of font-size…

Default

x-small

20px

1in

larger

1cm

1mm

100%

2.54cm

Different unit sizes, within context of font-size: 10px

Different unit sizes, within context of font-size: 20px

Different unit sizes, without context (<body> has font-size: 14px)

Different quantities