PX to EM/REM Converter - CSS Unit Converter

Convert between px, emandrem

Convert

Default browser is 16px

Quick conversion table

PXEMREM%
8px0.5em0.5rem50%
10px0.625em0.625rem62.5%
12px0.75em0.75rem75%
14px0.875em0.875rem87.5%
16px1em1rem100%
18px1.125em1.125rem112.5%
20px1.25em1.25rem125%
24px1.5em1.5rem150%
28px1.75em1.75rem175%
32px2em2rem200%
36px2.25em2.25rem225%
40px2.5em2.5rem250%
48px3em3rem300%
56px3.5em3.5rem350%
64px4em4rem400%
72px4.5em4.5rem450%

PX to EM/REM Converter Online - Professional free CSS unit conversion tool

Tan Phat Digital's PX to EM/REM Converter tool helps you convert between CSS units quickly and accurately. Supports bidirectional conversion between px, em and rem. Customize base font-size (default 16px according to browser standard). Quick conversion panel with 16 popular sizes from 8px to 72px. Copy values ​​with one click. Realtime calculations as you type. Essential tool for responsive web design and accessibility. Completely free, no registration required.

Outstanding features

Bidirectional conversion: px ↔ em ↔ rem
Customize base font-size (root font-size)
Quick conversion table with 16 popular sizes
Displays the corresponding% value
Copy the value with one click
Realtime calculation when entering
Click on the table to auto-fill the
value Simple, intuitive interface
No need to install, use right on the web
Completely free, unlimited

Why should we use em/rem instead of px in CSS?

In modern responsive web design, em and rem are the recommended units instead of fixed px. REM (root em) is based on the font-size of the root element (html), helping to scale the entire UI by just changing one value. EM is based on the font-size of the parent element, flexible for component-based design. According to WCAG 2.1 accessibility guidelines, users can increase the font-size in browser settings - if you use fixed px, the layout may break. With rem/em, the layout automatically scales according to user preference. Google also prioritizes mobile-friendly sites in rankings, and responsive units are an important part. This tool helps you convert from px (easy to visualize) to rem/em (responsive) easily.

Benefits when used

  • •Create responsive design that automatically scales according to screen size
  • •Meet accessibility - respect user font-size preferences
  • •Easy to maintain - change base font-size scale throughout UI
  • •Consistent spacing and typography across breakpoints
  • •SEO friendly - Google prioritizes mobile-friendly sites
  • •Component-based design gives me local scaling
  • •Save time on manual calculations
  • •Learn and understand CSS units through practice

Detailed instructions on how to convert px to em/rem

  1. 1Set base font-size (default 16px - standard browser default)
  2. 2Enter the value in any cell: px, em, or rem
  3. 3Other cells automatically update with the corresponding value
  4. 4Click the copy icon to copy the value to use
  5. 5Or click on the row in the table to auto-fill the
  6. 6value Paste the value into your CSS

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