EM ↔ Pixels Converter
Convert CSS EM units to pixels with adjustable base font size
Adjust the base font size (typically 16px in browsers) to match your CSS settings
Enter EM value to convert to pixels
Enter pixels to convert to EM units
Conversion Result
1em = 16px
Base font size: 16px • Formula: 1 × 16 = 16px
📚 EM ↔ Pixels Conversion Details
What is EM?
EM is a relative CSS unit that inherits the parent element's font size. 1em equals the current font size.
EM to Pixels Formula
pixels = em × base-font-size
Multiply EM value by the base font size (default: 16px).
Pixels to EM Formula
em = pixels ÷ base-font-size
Divide pixels by the base font size (default: 16px).
Common Base Font Sizes
- Default browser: 16px
- Mobile designs: 14px
- Large text: 18px
- Print media: 12px
📏 How EM Units Work
EM is a relative unit in CSS that scales based on the parent element's font size:
- Relative to parent: 1em = parent's computed font-size
- Cascading effect: Nested EM values compound
- Flexible scaling: Great for responsive design
- Accessibility: Respects user's browser settings
// Example: Base font size = 16px
1em = 16px
2em = 2 × 16 = 32px
0.5em = 0.5 × 16 = 8px
// Example: Base font size = 14px
1em = 14px
2em = 2 × 14 = 28px
1.5em = 1.5 × 14 = 21px
1em = 16px
2em = 2 × 16 = 32px
0.5em = 0.5 × 16 = 8px
// Example: Base font size = 14px
1em = 14px
2em = 2 × 14 = 28px
1.5em = 1.5 × 14 = 21px
📊 Common EM to Pixels Conversion Table (16px base)
| EM Units | Pixels | Common Use |
|---|---|---|
| 0.25em | 4px | Small margins |
| 0.5em | 8px | Padding, line-height |
| 0.75em | 12px | Small text |
| 1em | 16px | Base font size |
| 1.25em | 20px | Subheadings |
| 1.5em | 24px | Headings |
🆚 EM vs REM vs Pixels
| Unit | Relative To | Pros | Cons |
|---|---|---|---|
| EM | Parent element | Flexible, responsive | Compounds in nesting |
| REM | Root element (html) | Consistent, no compounding | Less flexible for components |
| Pixels (px) | Fixed size | Precise, predictable | Not responsive |
❓ Frequently Asked Questions
Q: What's the default base font size in browsers?
A: Most browsers default to 16px, but users can change this in their settings.
Q: Why use EM instead of pixels?
A: EM units are responsive, scale better, and respect user accessibility settings.
Q: How does EM differ from REM?
A: EM is relative to the parent element, while REM is always relative to the root (html) element.
Q: Can I change the base font size in this converter?
A: Yes! Use the slider above the converter to adjust the base font size from 10px to 24px.