What is the default root font size?

Browsers default the root (html) font size to 16px unless you override it, so 1rem equals 16px in a fresh stylesheet.

Is anything uploaded?

No — the conversion runs entirely in your browser and nothing is sent anywhere.

PX to REM Converter

Q: How do I convert px to rem?

Divide the pixel value by the root font size. With the default 16px root, 24px ÷ 16 = 1.5rem. The converter does this for you.

Convert pixel sizes to rem for scalable, accessible CSS.

Convert px to rem

The rem unit is relative to the root (html) element’s font size, so sizing typography and spacing in rem keeps your layout scalable and respects the user’s browser font-size preferences for accessibility.

To convert, divide the pixel value by the root font size — with the default 16px root, 24px ÷ 16 = 1.5rem. Enter your numbers above and the result updates instantly, all in your browser.