Unit

Absolute Lengths

Unit
Description

cm

centimeters

mm

millimeters

in

inches (1in = 96px = 2.54cm)

px *

pixels (1px = 1/96th of 1in)

pt

points (1pt = 1/72 of 1in)

pc

picas (1pc = 12 pt)

Relative Lengths

Unit
Description

em

Relative to the font-size of the element (2em means 2 times the size of the current font)

ex

Relative to the x-height of the current font (rarely used)

ch

Relative to width of the "0" (zero)

rem

Relative to font-size of the root element

vw

Relative to 1% of the width of the viewport*

vh

Relative to 1% of the height of the viewport*

vmin

Relative to 1% of viewport's* smaller dimension

vmax

Relative to 1% of viewport's* larger dimension

%

Relative to the parent element

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