CSS & Responsive Design Tool
PX to REM Converter
Convert pixels to responsive REM and EM units in real-time with customizable base sizes and instant CSS code export.
Default standard browser root is typically 16px.
px
PX
REM
CSS: font-size: 1rem;
Standard Web Conversion Scale
| Pixels (PX) | REM (16px base) | Common Usage |
|---|---|---|
| 12px | 0.75rem | Caption / Small text |
| 14px | 0.875rem | Secondary body |
| 16px | 1rem | Standard body default |
| 18px | 1.125rem | Lead paragraph |
| 24px | 1.5rem | Heading 3 (h3) |
| 32px | 2rem | Heading 2 (h2) |
Why Use REM Instead of Fixed Pixels in CSS?
While pixels (px) represent absolute static display units, REM (Root EM) units are relative to the root <html> element's font-size. Adopting REM guarantees better website accessibility, as your layout dynamically scales when visitors modify default typography settings inside their browser preferences.
The Formula for PX to REM Conversion
The standard mathematical calculation is straightforward:
REM = Pixels / Base Font Size
Privacy & Client-Side Execution
All calculations are executed instantly in local browser memory. No code snippets or layout settings are transmitted over the web.