Px to Em Converter
Convert between CSS units - pixels (px), em, points (pt), and percentage (%)
CSS Unit Converter
Default browser font size is typically 16px
Conversion Results
Conversion formulas:
• 1 em = base font size in px
• 1 pt = 0.75 px
• 1 em = 100%
• Base font size: 16px
CSS Unit Recommendations
Common Font Size Conversions
| Description | Pixels | Em | Points | Percent |
|---|---|---|---|---|
| Small text | 12px | 0.750em | 9.0pt | 75.0% |
| Default text | 14px | 0.875em | 10.5pt | 87.5% |
| Base font size | 16px | 1.000em | 12.0pt | 100.0% |
| Large text | 18px | 1.125em | 13.5pt | 112.5% |
| Heading text | 24px | 1.500em | 18.0pt | 150.0% |
| Large heading | 32px | 2.000em | 24.0pt | 200.0% |
| Extra large heading | 48px | 3.000em | 36.0pt | 300.0% |
* Based on base font size of 16px
CSS Units Guide
Pixels
Fixed units based on screen resolution
Best for: Precise layouts, borders
Em
Relative to parent font size
Best for: Scalable typography
Points
1/72 of an inch (print only)
Best for: Print stylesheets
Percentage
Relative to parent element
Best for: Responsive layouts
CSS Best Practices
Use em for scalable typography
Use px for borders and fixed layouts
Consider rem for root-relative sizing
Avoid pt for screen display
Test across different devices
Understanding CSS Units
What are CSS Units?
CSS units define the size of elements in web design. There are absolute units (like pixels) that have fixed sizes, and relative units (like em and %) that scale based on other elements.
Why Convert Between Units?
- •Create responsive, scalable designs
- •Ensure consistency across devices
- •Optimize for accessibility
- •Maintain design proportions
Conversion Formulas
Em to Pixels: em × base font size = px
Pixels to Em: px ÷ base font size = em
Points to Pixels: pt ÷ 0.75 = px
Em to Percent: em × 100 = %
Note: Default browser base font size is typically 16px, but users can change this in their browser settings.
When to Use Each Unit
Use Em When:
- • Building scalable typography systems
- • Creating responsive components
- • Supporting accessibility preferences
- • Building nested component hierarchies
Use Pixels When:
- • Precise control is needed
- • Creating pixel-perfect designs
- • Defining borders and shadows
- • Fixed-size elements are required