Online PX ↔ REM CSS Unit Converter

Convert between px, rem, em, pt, vw, and vh — type in any field for instant live conversion.

Base Font Size (px) — root rem context

Viewport Width (px) — for vw

Viewport Height (px) — for vh

PX (pixels)

REM

PT (points)

VW (viewport width)

VH (viewport height)

PX	REM	EM	PT	Common Use

CSS Unit Guide

px: Absolute pixel. Ignores user browser font settings.
rem: Relative to the root (<html>) font size. Best for accessible, scalable layouts.
em: Relative to the parent element's font size. Can cascade unexpectedly.
pt: Points — 1pt = 1/72 inch. Used in print CSS.
vw/vh: 1vw = 1% of viewport width. Great for responsive typography.