CSS Unit Converter

Convert between CSS units — px, rem, em, pt, vw, vh, cm, mm, in, and %. Configure base font size, viewport dimensions, and parent size.

Value

From Unit

Unit	Value	Description
px	16	Pixels — absolute screen units
rem	1	Root em — relative to root font size
em	1	Em — relative to parent font size
pt	12	Points — 1pt = 1.333px at 96dpi
vw	1.11111	Viewport width — 1vw = 1% of viewport width
vh	1.77778	Viewport height — 1vh = 1% of viewport height
cm	0.423333	Centimeters — 1cm ≈ 37.8px at 96dpi
mm	4.23333	Millimeters — 1mm ≈ 3.78px at 96dpi
in	0.166667	Inches — 1in = 96px at 96dpi
%	1.11111	Percentage — relative to parent element