PX to REM Converter
Convert between pixels and rem units with real-time calculation. Perfect for responsive web design and CSS development.
Root Font Size Configuration
px
Pixels (PX)
px
Absolute unit – fixed size regardless of parent elements
REM Units
rem
Relative to root font size – scales with root element
Conversion Formula
PX to REM
px ÷ 16 = rem
REM to PX
rem × 16 = px
Generated CSS Code
/* Enter values above to see generated CSS */
/* Example: */
.element {
font-size: 1rem; /* 16px */
margin: 1.25rem; /* 20px */
padding: 0.875rem; /* 14px */
}
/* Example: */
.element {
font-size: 1rem; /* 16px */
margin: 1.25rem; /* 20px */
padding: 0.875rem; /* 14px */
}
When to Use PX vs REM
Use Pixels (PX) For:
- Borders and dividers that need consistent thickness
- Small decorative elements and icons
- Fine-tuned spacing adjustments
- Media queries and breakpoints
Use REM Units For:
- Font sizes for scalable typography
- Margins and padding for consistent spacing
- Component dimensions that should scale
- Creating accessible, user-controlled scaling
Pro Tips
Responsive Design
REM units automatically adapt when users change their browser’s default font size, improving accessibility.
Accessibility
Using REM for font sizes respects user preferences and creates more inclusive web experiences.
Best Practice
Set a root font size of 16px and use REM for most sizing, with PX for precise details.