Pixels ↔ EM Converter
Convert between pixels and EM units for CSS and web design
CSS Preview:
font-size: 16px; /* = 1.00em */
/* Example usage */
body { font-size: 1em; }
h1 { font-size: 2em; }
p { font-size: 0.875em; } /* 14px */
📚 Pixels ↔ EM Conversion Details
Pixels to EM Formula
To convert pixels to EM, divide the pixel value by the base font size (usually 16px).
EM to Pixels Formula
To convert EM to pixels, multiply the EM value by the base font size.
EM Units Explained
EM is a relative unit in CSS:
- 1em = current font size
- Relative to parent element
- Great for responsive design
- Cascades through inheritance
Common Uses
- CSS font sizing
- Responsive web design
- Accessibility scaling
- Mobile-first design
💡 Understanding EM Units
EM units are relative to the parent element's font size. If no font size is defined, browsers default to 16px. This makes EM perfect for creating scalable and accessible designs that adapt to user preferences.
📏 How This Converter Works
This is a bidirectional converter that works in real-time:
- Pixels → EM: When you type in the pixels field, the EM field automatically updates
- EM → Pixels: When you type in the EM field, the pixels field automatically updates
- Change Base Size: Adjust the base font size to see how EM values change
- Real-time: Updates happen as you type, no button clicks required
em = pixels ÷ baseFontSize
pixels = em × baseFontSize
// Example with 16px base:
pixels = 24
em = 24 ÷ 16 = 1.5
// Example with 20px base:
pixels = 24
em = 24 ÷ 20 = 1.2
📊 Common Conversion Table (16px Base)
| Pixels (px) | EM Units | Common Use |
|---|---|---|
| 12px | 0.75em | Small text |
| 14px | 0.875em | Paragraph text |
| 16px | 1.00em | Base size |
| 18px | 1.125em | Large text |
| 24px | 1.50em | Subheadings |
| 32px | 2.00em | Headings |
❓ Frequently Asked Questions
A: Most browsers default to 16px. You can change this in the converter to match your project's base font size.
A: EM is relative to the parent element's font size, while REM is always relative to the root (html) element's font size.
A: EM units are scalable and better for accessibility. They allow users to resize text in their browser settings.
A: This converter provides calculations up to 4 decimal places for precise CSS values.