Quick Summary

PX to REM Converter converts absolute pixel units (`px`) in CSS stylesheets to scalable root REM units (`rem`) based on a standard 16px base font size for web accessibility.

PX to REM Converter & CSS Unit Reference Table

Convert pixel values in CSS stylesheets into accessible relative REM units based on a 16px root font size.

Instant unit conversion

Scans CSS declarations and replaces hardcoded `px` font sizes, margins, and paddings with clean `rem` values.

Palette & rule inspector

Extracts unique hex, rgb, and hsl color codes from stylesheets alongside CSS rule metrics.

Web accessibility

Using REM units enables responsive scaling when users change their default browser text size settings.

PX to REM Conversion Table (16px Base Font Size)

Quick reference cheat sheet for standard frontend typography and layout spacing based on a default 16px root font size:

Pixel Value (PX)	REM Equivalent (16px Base)	Common CSS Usage
4 px	0.25 rem	Extra Small Padding / Gap
8 px	0.5 rem	Small Margin / Icon Spacing
12 px	0.75 rem	Caption / Small Body Text
16 px	1.0 rem	Standard Body Text (Default)
20 px	1.25 rem	H5 Heading / Subtitle
24 px	1.5 rem	H4 Heading / Container Padding
32 px	2.0 rem	H3 Title / Large Gap
48 px	3.0 rem	H1 Banner Title

Frequently asked questions

How do you calculate PX to REM?

The formula to convert pixels to REM is: REM = PX / Base Font Size (default 16px). For example, 24px / 16px = 1.5rem.

Why use REM instead of PX in CSS?

REM units scale dynamically based on the root HTML font size, making layouts accessible and responsive for users with custom browser font preferences.

Typography & Formula Guide

Read our complete guide on PX to REM formulas, 62.5% root font math, and Tailwind CSS utility mapping.

Read Guide