CSS Unit Converter Online - px to rem, em, vw Calculator

Free online CSS unit converter. Convert between px, rem, em, vw, vh, pt, cm, mm and more with configurable base font size.

Input Value

Base Font Size: 16px

Used for rem, em, and % calculations

Viewport Width: 1024px

Viewport Height: 768px

Quick Presets

Conversions

Common CSS Unit Conversions

Unit	Description	Example
px	Pixels (absolute)	16px
rem	Root em (relative to html font-size)	1rem = 16px (default)
em	Relative to parent element font-size	1em = parent font-size
vw	Viewport width (1vw = 1% of viewport width)	50vw = half screen width
vh	Viewport height (1vh = 1% of viewport height)	100vh = full screen height
%	Relative to parent element	50% = half parent width
pt	Points (typography, 1pt = 1.333px)	12pt
cm/mm/in	Physical units (rarely used in web)	2.54cm = 1in = 96px

Convert between all CSS units instantly.

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