How do I convert PX to REM?

Divide the pixel value by the root font size (default 16px). 24px ÷ 16 = 1.5rem. Use the Unit Converter for instant conversion with any base size.

What is the difference between REM and EM?

REM is relative to the root (html) font size and is consistent everywhere. EM is relative to the parent element's font size, so it compounds when nested — 1.2em inside 1.2em becomes 1.44em equivalent.

When should I use VW units?

Use vw for viewport-relative sizing: full-width elements (100vw), fluid typography (combined with clamp()), and viewport-height sections (100vh). Avoid for text sizing alone — it doesn't account for user font preferences.

How to Convert Between CSS Units (PX, REM, EM, VW, %)

📏

Try Unit Converter

Free, no signup →