CSS Units Converter

Enter a pixel size and root font size to see rem/em/% equivalents for typography and spacing. Convert px values to rem, em, and % based on a root font size.

Introduction

CSS Units Converter is a free, browser-based utility in our CSS Tools collection. Enter a pixel size and root font size to see rem/em/% equivalents for typography and spacing. CSS Units Converter translates pixel measurements into rem/em/percentage values using your chosen root font size. Everything runs locally in your browser — inputs stay on your device, with no account or upload required. Highlights include px input.

Features

px input
Configurable root size
rem/em/% output

How to use

1
Enter px and root size.
2
Copy rem if needed.

Example

16px root

Input

24px

Output

1.5rem

Benefits

Run CSS Units entirely in the browser with no signup or installation.
Keep sensitive sample data private — processing never leaves your device.
px input
Configurable root size
rem/em/% output
Pair it with CSS Formatter and Flexbox Generator when your workflow needs adjacent utilities.

FAQs

Shown as equal to rem assuming root context.

No.

Not included in this version.

Yes. CSS Units on EverydayDevTools is free, with no account, watermarks, or usage caps for normal interactive use.

No. CSS Units runs in your browser. Your input is processed locally and is not sent to EverydayDevTools servers.

Enter a pixel size and root font size to see rem/em/% equivalents for typography and spacing. It fits everyday css tools tasks when you want a fast local utility instead of installing a CLI or opening a heavy IDE feature.

Core capabilities include: px input; Configurable root size; rem/em/% output.

Developers often pair CSS Units with CSS Formatter, Flexbox Generator, Grid Generator. Open Related tools on this page for quick links.