About the CSS Unit Converter

Type a value, pick the unit it is in, and every other CSS unit updates at once. Relative units need a reference: rem uses the root font size, em and % use the parent font size, and vw / vh use the viewport width and height. The viewport boxes start at your current window size, but you can change any of these to match your design.

The absolute units are fixed by the CSS spec: 1in = 96px, 1cm ≈ 37.8px, 1mm ≈ 3.78px, 1pt = 1⁄72in (1.333px) and 1pc = 16px.

Is anything uploaded? No. All the math runs in your browser.