CSS units Cheat Sheet - 30 Seconds Of Code

px: Absolute pixel value
rem: Relative to the font-size of the root element
em: Relative to the font-size of the element
%: Relative to the parent element
vw: Relative to the viewport's width, 1vw = 1% * viewport width
vh: Relative to the viewport's height, 1vh = 1% * viewport height
vmin: Relative to the viewport's smaller dimension, 1vmin = min(1vh, 1vw)
vmax: Relative to the viewport's larger dimension, vmax = max(1vh, 1vw)
ch: Relative to the width of the glyph "0" of the element's font
in: Inches 1in = 2.54cm = 96px
pc: Picas 1pc = 1in / 6 = 16px
pt: Points 1pt = 1in / 72 = 1.333px (approximately)
cm: Centimeters 1cm = 96px / 2.54 = 37.8px (approximately)
mm: Millimeters 1mm = 1cm / 10 = 3.78px (approximately)