CSS Units

Convert px, rem, em, pt, vw, vh and % with your own base size and viewport, and build fluid clamp() font sizes with a live preview.

Context

Root font size (px) Parent font size (px, for em and %) Viewport width (px) Viewport height (px)

Convert

Value Unit

Fluid typography `clamp()`

Smallest size (px) Largest size (px) From viewport (px) To viewport (px)

Preview at viewport width

The quick brown fox jumps over the lazy dog

Common sizes