H1_PX to REM Converter - CSS Units | MultiTool

Convert pixels to rem and rem to pixels with any root font size (default 16px). Includes a quick reference table for common sizes.

ROOT FONT SIZE (base, px)

VALUE IN PX

RESULT1.5000rem (base 16px)

How it works

Enter your root font size (16px by default), then convert either direction: px to rem or rem to px, with a quick table of the most common font sizes.

Everything runs entirely in your browser. Nothing you type is ever sent to any server or stored.

What is rem?+

A CSS unit relative to the root element's font size (html). 1rem = root size, so with a 16px root, 1rem = 16px.

Why use rem instead of px?+

Rem scales with the user's browser settings, improving accessibility — and it makes responsive design easier.

How do I convert?+

rem = px / base. With a 16px base, 24px = 1.5rem.

What is the default base?+

16px, the browser default — but many design systems use 14px or 10px (which makes 1rem = 10px, easy math).

Does changing the base matter?+

Yes — the same px value produces different rem values depending on your root font size, so always check your project's base.

Is it free?+

Yes, completely free with no account.

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