px ↔ rem
Convert CSS pixel (px) values to REM font units with custom base font size.
Seconds ↔ Minutes ↔ Hours Converter
About px ↔ rem
The PX to REM Converter transforms pixel font sizes and spacing dimensions into relative REM units based on a configurable base root font size (default 16px). Essential for responsive CSS web design.
How to Use px ↔ rem
Step 1
Enter your target Pixel (px) value into the input box.
Step 2
Optionally adjust the Root Font Size (default is 16px).
Step 3
Copy the calculated REM value or full CSS declaration snippet.
Practical Use Cases for px ↔ rem
Responsive Web Design Layouts
Convert fixed pixel values from Figma or design specs into responsive REM font sizes and padding.
Web Accessibility Compliance (WCAG)
Use REM units so typography scales smoothly when users zoom or change default browser text sizes.
Input & Output Examples
Converting 24px with 16px Base
Pixel: 24px, Base: 16px
1.5rem (CSS snippet: font-size: 1.5rem;)
Key Features & Performance
- ✓Bidirectional conversion: PX to REM and REM to PX.
- ✓Customizable Root Base Font Size (default 16px).
- ✓Instant CSS snippet generation with 1-click copy.
Key Terminology & Definitions
REM (Root EM)
A relative CSS length unit equal to the computed font-size of the root <html> element.
Base Font Size
The default pixel font size assigned to the root element, typically 16px in modern web browsers.