01 · Environment

Display baseline

Base font size (px) 16 px

Reference container width (px) 800 px

In the same environment

Unit examples

Choose a unit

Value

Current length: —

Unit A · value

Unit

Unit B · value

Unit

- -

Each row shows one unit with an illustration bar and approximate pixels; ex and ch are browser estimates.
绝对单位
Unit	Description	Visualization	计算值 (px)
cm	centimeters		-
mm	millimeters		-
Q	quarter-millimeters		-
in	英寸 (1in = 96px)		-
pc	派卡 (1pc = 16px)		-
pt	points (1pt = 1/72in)		-
px	pixels (relative to the device)		-
相对单位
Unit	Description	Visualization	计算值 (px)
em	relative to the element font size		-
rem	relative to the root element font size		-
ex	relative to the height of character "x"		-
ch	relative to the width of character "0"		-
vw	1% of viewport width		-
vh	1% of viewport height		-
vmin	1% of the smaller viewport dimension		-
vmax	1% of the larger viewport dimension		-
%	relative to the parent element (usually width)		-
cap	relative to capital-letter height		-
ic	relative to ideographic-character width		-
lh	relative to its own line height		-
rlh	relative to the root element line height		-
vi	relative to viewport inline size		-
vb	relative to viewport block size		-