Pixel to REM/EM Converter
Convert pixels to REM and EM units for responsive design
Pixel to REM/EM Converter
Conversion Table
| Pixels | REM | EM |
|---|---|---|
| 8px | 0.5000rem | 0.5000em |
| 10px | 0.6250rem | 0.6250em |
| 12px | 0.7500rem | 0.7500em |
| 14px | 0.8750rem | 0.8750em |
| 16px | 1.0000rem | 1.0000em |
| 18px | 1.1250rem | 1.1250em |
| 20px | 1.2500rem | 1.2500em |
| 24px | 1.5000rem | 1.5000em |
| 28px | 1.7500rem | 1.7500em |
| 32px | 2.0000rem | 2.0000em |
| 36px | 2.2500rem | 2.2500em |
| 40px | 2.5000rem | 2.5000em |
| 48px | 3.0000rem | 3.0000em |
| 56px | 3.5000rem | 3.5000em |
| 64px | 4.0000rem | 4.0000em |
REM vs EM: What's the Difference?
REM (Root EM)
Relative to the root element's font size (usually the html element). Always consistent across the entire page.
EM
Relative to the parent element's font size. Can compound when nested, making calculations more complex.
Recommendation
Use REM for most spacing and sizing to maintain consistency. Use EM for components that should scale with their parent.
Privacy Notice
All conversions are performed locally in your browser. No data is sent to any server.
Your Privacy is Protected
All processing happens entirely in your browser. No data is stored, transmitted, or tracked. Your information remains completely private and secure on your device.
About Pixel to REM Converter
Convert pixels (px) to REM and EM units for responsive web design with our pixel to REM converter. REM (root em) and EM units are relative CSS units that scale with base font size, essential for creating accessible, responsive websites that adapt to user preferences. Unlike fixed pixels, REM units respect browser font size settings, helping users with visual impairments. Our converter calculates REM/EM values from pixels based on customizable base font size (default 16px), shows conversion formulas, and supports batch conversion. Perfect for web developers implementing responsive typography, designers converting mockups to code, accessibility specialists ensuring scalable interfaces, and anyone building modern, user-friendly websites.
Key Features
Px to REM Conversion
Convert pixel values to REM units instantly. Based on root font size (typically 16px browser default).
Px to EM Conversion
Also converts to EM units (relative to parent element font size). Useful for component-scoped sizing.
Custom Base Font Size
Set custom base font size if your site uses different root font size. Accurate conversions for any setup.
Conversion Formula Display
Shows calculation (px Ãˇ base = REM) so you understand the math and can manually calculate if needed.
Batch Conversion
Convert multiple pixel values at once. Perfect for converting entire design systems or style guides.
Reverse Conversion
Convert REM/EM back to pixels. Useful for understanding actual rendered sizes.
How to Use Pixel to REM Converter
Set base font size (default 16px, or your site's root font size)
Set base font size (default 16px, or your site's root font size). Follow the tool interface to complete this step.
Enter pixel value you want to convert
Enter pixel value you want to convert. Follow the tool interface to complete this step.
View instant REM and EM equivalents
View instant REM and EM equivalents. Follow the tool interface to complete this step.
Copy REM value for use in CSS
Copy REM value for use in CSS. Follow the tool interface to complete this step.
For multiple values, use batch conversion mode
For multiple values, use batch conversion mode. Follow the tool interface to complete this step.
Use in CSS: font-size: 1.5rem; instead of font-size: 24px;
Use in CSS: font-size: 1.5rem; instead of font-size: 24px;. Follow the tool interface to complete this step.
Frequently Asked Questions
What's the difference between PX, REM, and EM?
PX (pixels) is fixed, absolute size. REM (root em) is relative to root element font size (html). EM is relative to parent element font size. PX doesn't scale with user settings; REM and EM do, improving accessibility.
Should I use REM or EM?
Use REM for most sizing (font-size, margins, padding) - it's predictable and relative to root. Use EM for sizing that should scale with component font size (padding inside buttons). REM is generally safer and more popular.
What is the default browser font size?
16px is standard browser default. So 1rem = 16px by default. However, users can change this in browser settings. That's why REM is better for accessibility - it respects user preferences.
How do I calculate REM manually?
Divide pixels by base font size: 24px Ãˇ 16px = 1.5rem. For any base size: desired px Ãˇ base px = REM value. Our converter does this instantly for any base size.
Should I convert everything from PX to REM?
Not necessarily. Use REM for text sizes, spacing (margins/padding), and layout widths. PX is okay for borders (1px border), small precise elements, or when exact sizing is critical. Mix based on needs.
Does using REM affect layout?
Yes, if user changes font size, REM-based layouts scale accordingly. This is a feature, not bug - ensures accessible, readable content for all users. Design should accommodate variable text sizes.
How do REM units work in CSS?
REM always refers to root (html element) font size. If html {font-size: 16px}, then 1rem = 16px everywhere. Change root size to scale entire site. Example: font-size: 1.5rem equals 24px with 16px root.
Are REM units supported in all browsers?
Yes, REM has excellent support in all modern browsers (IE9+). Safe to use in production. No fallbacks needed for current browser landscape.
Use Cases
- Responsive Typography: Use REM for font sizes that scale with user's browser settings. Improves accessibility and respects user preferences for larger/smaller text.
- Design System Conversion: Convert design mockups (in pixels) to responsive REM units. Maintain design intent while creating flexible, scalable interfaces.
- Accessibility Compliance: REM units are WCAG recommended for accessibility. Users who increase browser font size see proportionally scaled layouts.
- Component Spacing: Use REM for margins, padding, and spacing to create components that scale proportionally with text size.
- Media Query Breakpoints: Use EM units in media queries for breakpoints that respond to user's font size preference, not just screen width.