CSS Unit Conversions

Essential tools for modern web development

Understanding CSS Units

CSS units are fundamental to creating responsive and well-designed websites. Choosing the right units helps ensure your designs look great across all device sizes.

CSS units fall into two main categories: absolute and relative units. Absolute units (like pixels) remain consistent across different devices, while relative units (like rem, em, %) scale based on other factors such as font size or viewport dimensions.

Modern responsive design typically favors relative units over absolute units for better adaptability across devices.

Popular CSS Unit Conversions

PX to REM Converter

Convert pixel values to REM units for scalable typography and responsive layouts.

Typography

PX to EM Converter

Convert pixels to EM units for element-relative sizing in CSS.

Typography

PX to % Converter

Convert pixel values to percentage units for fluid layouts and responsive design.

Layout

PX to VW Converter

Convert pixels to viewport width units for truly responsive, screen-relative sizing.

Viewport

PX to VH Converter

Convert pixels to viewport height units for vertical scaling based on screen height.

Viewport

REM to PX Converter

Convert REM units back to pixels based on the root element font size.

Typography

All CSS Unit Converters

Relative Units

PX to REM Converter
PX to EM Converter
PX to % Converter
REM to PX Converter
EM to PX Converter
% to PX Converter
REM to EM Converter
EM to REM Converter

Viewport Units

PX to VW Converter
PX to VH Converter
PX to VMIN Converter
PX to VMAX Converter
VW to PX Converter
VH to PX Converter

Absolute Units

PX to PT (Points) Converter
PX to PC (Picas) Converter
PX to IN (Inches) Converter
PX to CM (Centimeters) Converter
PX to MM (Millimeters) Converter
PT to PX Converter

CSS Units Quick Reference

Unit Type Description Best For
px Absolute Pixels, 1/96th of an inch Borders, shadows, fixed elements
rem Relative Root element font-size Typography, spacing, responsive layouts
em Relative Parent element font-size Element-specific scaling, padding
% Relative Percentage of parent Fluid layouts, responsive widths
vw Viewport 1% of viewport width Width-responsive elements
vh Viewport 1% of viewport height Height-responsive elements
pt Absolute Points, 1/72nd of an inch Print stylesheets

For modern responsive web development, prefer using relative units like rem, em, % over absolute units like px.