PX to REM Converter
Convert pixels to REM units instantly. Perfect for responsive design, accessibility compliance, and modern CSS development.
Batch Mode
Switch to batch conversion for multiple values
Default browser font size is usually 16px
🎯 How to Use This Converter (It's Super Easy!)
🎆 New & Improved: Single-Direction PX to REM Converter!
Focused on PX to REM conversion only. Input pixels, get REM instantly. Now includes powerful batch conversion mode!
1For Most Users (Recommended)
From Figma to CSS:
Copy a pixel value from your design (like "24px"), paste just the number "24" in the PX field, and instantly get the REM equivalent!
Need to convert multiple values?
Toggle "Batch Mode" to convert up to 20 values simultaneously. Perfect for processing design specs!
Different base font size?
Adjust the "Base Font Size" if your project uses something other than 16px (like 14px or 18px).
2Batch Mode Features
Multiple conversions:
Add up to 20 rows for simultaneous conversions. Perfect for processing design specs or component libraries.
Unlimited input range:
No restrictions on values - convert any PX value from decimal points to thousands with precision.
Dynamic row management:
Add and remove conversion rows as needed, with instant results for each entry.
💼 Real-World Workflow Tips:
😤 Tired of These Common Web Design Frustrations?
"My website breaks when users zoom in!"
Fixed pixel layouts collapse when users increase browser font size for better readability. Your beautiful design becomes unusable for people who need larger text.
"Converting Figma designs is a nightmare!"
Manually calculating every font size, margin, and padding from your design files. Hours wasted on math that should take seconds.
"Updating my design system takes forever!"
When you need to change spacing or typography, you're hunting through hundreds of CSS files, updating pixel values one by one. There has to be a better way!
✨ What if there was a simple solution?
REM units solve all these problems automatically. Here's how:
User-Friendly Scaling
Your website automatically adapts when users change their browser font size. Happy users, happy you! No more broken layouts.
Instant Conversions
Copy-paste Figma values, get perfect REM equivalents in seconds. Our tool handles all the math so you can focus on creating amazing designs.
One-Click Updates
Change your entire design system's scale by adjusting one root font size. What used to take hours now takes minutes.
💡 Pro tip: Many leading tech companies use REM units for better accessibility and responsive design. Join developers worldwide who've made the switch!
🔍 PX vs REM: Complete Comparison
| Feature | REM | PX |
|---|---|---|
| Accessibility Support | ✅ Respects user preferences | ❌ Ignores user settings |
| Responsive Scaling | ✅ Automatic scaling | ⚠️ Manual media queries |
| Browser Support | ✅ IE9+ (99% coverage) | ✅ Universal support |
| Design Precision | ⚠️ Relative precision | ✅ Pixel-perfect control |
| Maintenance Effort | ✅ Low maintenance | ❌ High maintenance |
📊 PX to REM Conversion Table
Common conversions based on 16px root font size (browser default)
Formula: REM = PX ÷ Base Font Size (16px default)
🤔 Questions Everyone Asks (And You Probably Do Too!)
"Wait, will switching to REM break my existing website?"
Relax! You don't need to convert everything at once. Start with new components or gradually migrate section by section. Most developers begin with font sizes and spacing, then move to other elements when they're comfortable.
💡 Pro tip: Test on a staging environment first, just like any other CSS changes.
"My designer gives me Figma files in pixels. Now what?"
Great! This is exactly why we built this tool. Copy the pixel values from Figma, paste them here, and get instant REM equivalents. Your designer doesn't need to change anything in their workflow.
🎨 Many developers bookmark this tool for quick Figma-to-CSS conversions.
"I'm not a math person. Is this going to be complicated?"
Not at all! The beauty of REM is that you don't need to think about math. Type a number, get a result. Our tool handles all calculations, and once you're using REM, your CSS becomes more predictable, not less.
📚 Think of REM as "smart pixels" that automatically adapt to different situations.
"When should I definitely NOT use REM?"
Good question! Stick with pixels for: 1px borders (they should always be 1px), box-shadows, small icons, and any decorative elements where you need pixel-perfect control. Think "structural elements = REM, decorative details = PX."
🎯 Rule of thumb: If it should scale with text, use REM. If it should stay the same size, use PX.
"My boss/client is asking why the website 'looks different' on their computer..."
This is actually a feature! If your site looks larger on their screen, it means they have their browser font size increased for better readability. Your REM-based site is automatically accommodating their needs - that's excellent UX!
💼 Frame it as: "Our website automatically adapts to provide the best reading experience for every user."
"I'm using Tailwind/Bootstrap. Do I still need to worry about this?"
Great news! Modern frameworks like Tailwind and Bootstrap 5+ already use REM under the hood. But you still need this tool when working with custom values or converting design specs that don't match your framework's spacing scale.
🚀 Even framework users bookmark this tool for those "in-between" values that don't fit standard scales.
🙋♀️ Still have questions? The web development community is super helpful! Try searching "[your question] rem vs px" on Stack Overflow, or ask in communities like Discord, Reddit r/webdev, or Dev.to.
💡 CSS Unit Best Practices
✅ Use REM for:
- • Font sizes and line heights
- • Margins and padding
- • Container widths and heights
- • Media query breakpoints
- • Component spacing
🎯 Use PX for:
- • Border widths
- • Box shadows
- • Small icons and decorative elements
- • Fine-grained positioning
- • 1px lines and separators
🚀 Pro Tips for Modern CSS:
- • Use CSS custom properties with REM for flexible design systems
- • Consider using the 62.5% trick: html { font-size: 62.5%; } for easier calculations
- • Test your designs with different browser font sizes to ensure accessibility
- • Use REM for vertical rhythm and consistent spacing throughout your design
Start Converting PX to REM Today!
Experience our accurate and fast PX to REM converter. Free, reliable, and perfect for modern web development.
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