Px / Em / Rem Converter

Convert between px, em, and rem values for CSS sizing. Perfect for responsive design calculations.

Base Settings

px
px

Converter

Absolute unit - fixed size
Relative to parent font size (16px)
Relative to root font size (16px)

Visual Preview

Sample text at current size:
The quick brown fox jumps over the lazy dog
CSS Declaration
font-size: 16px;
Em Version
font-size: 1em;
Rem Version
font-size: 1rem;

Understanding CSS Units

px (Pixels)
Absolute unit. Always the same size regardless of parent elements.
em
Relative to parent element's font size. Compounds when nested.
rem
Relative to root element's font size. Consistent throughout the document.

About Px / Em / Rem Converter

A px/em/rem converter is an essential CSS utility tool that accurately converts between different CSS unit measurements including pixels (px), em units, and rem units, taking into account base font sizes and parent element relationships. This tool helps developers create responsive designs by providing precise calculations for different CSS sizing units used in modern web development.

Why use a Px / Em / Rem Converter?

Using a px/em/rem converter ensures consistent and scalable typography and spacing across responsive designs, helps maintain accessibility by using relative units appropriately, and saves time by eliminating manual calculations when converting between CSS units. It prevents sizing errors in responsive layouts, supports better user experience with scalable designs, and ensures proper implementation of modern CSS best practices.

Who is it for?

This tool is indispensable for front-end developers building responsive websites with scalable typography, UI/UX designers creating accessible and flexible design systems, CSS developers implementing modern layout techniques, web developers converting legacy pixel-based designs to responsive units, and anyone working with CSS who needs accurate conversions between different measurement units for optimal responsive design implementation.

How to use the tool

  1. Enter the value you want to convert in the source unit field (px, em, or rem)
  2. Specify the base font size if needed for accurate em and rem calculations
  3. Select the target unit you want to convert to from the available options
  4. View the automatically calculated equivalent values in all supported units
  5. Copy the converted values for use in your CSS stylesheets and responsive designs

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