PX to REM Converter
Multi-way conversion for responsive web design.
CSS Snippet
font-size: 2rem; /* 32px */
PX & REM Quick Conversion Tables
Standard reference based on a 16px root font size.
| Pixels (px) | REM |
|---|---|
| 1px | 0.0625rem |
| 2px | 0.125rem |
| 4px | 0.25rem |
| 8px | 0.5rem |
| 12px | 0.75rem |
| 16px | 1rem |
| 20px | 1.25rem |
| 24px | 1.5rem |
| 32px | 2rem |
| 48px | 3rem |
| 64px | 4rem |
| 80px | 5rem |
| 100px | 6.25rem |
| REM | Pixels (px) |
|---|---|
| 0.1rem | 1.6px |
| 0.5rem | 8px |
| 1rem | 16px |
| 2rem | 32px |
| 3rem | 48px |
| 4rem | 64px |
| 5rem | 80px |
| 10rem | 160px |
| 20rem | 320px |
| 40rem | 640px |
| 50rem | 800px |
| 80rem | 1280px |
| 100rem | 1600px |
Explore our other tools
Optimizing your typography with our PX to REM Converter is a vital step toward achieving a fully accessible layout. To maintain a professional codebase, we recommend pairing this tool with our CSS Minifier to reduce file weight or our JSON Formatter to debug data. These utilities ensure your project remains lightning-fast, highly scalable, and perfectly optimized for modern search engine rankings.
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How to Use Our PX to REM Converter
Using the PX to REM Converter on Toolbity is the easiest way to ensure your website typography is modern and accessible. Follow these simple steps to use our converter:
1. Set Your Base Size: Most browsers use a default of 16px. You can adjust this if your project uses a different root font size.
2. Enter Your Pixels: Type the pixel (PX) value you want to convert into the input field.
3. Get Instant Results: Our tool automatically calculates the REM value as you type.
4. Copy and Paste: Use the result directly in your CSS files for a fully responsive layout.
The Math Behind PX to REM Conversion
If you've ever wondered how the calculation works, it's a simple division formula. To get the REM value, you take the desired pixel size and divide it by the base font size as follows:
For example, if your base is 16px and you want a 24px heading, the calculation is $24 / 16$, which equals 1.5rem.
Why Responsive Design Requires REM Units
In 2026, web accessibility is a top priority. Unlike pixels, which are "fixed" sizes, REM units are relative to the user's browser settings. If a visually impaired user increases their default font size, your website will scale beautifully and remain readable. Using a PX to REM Converter helps you move away from rigid layouts and toward a "Mobile-First" philosophy that satisfies both users and search engines like Google.
Implementing relative units is a key requirement of the W3C Web Content Accessibility Guidelines (WCAG), which help ensure your typography is readable for all users.
Frequently Asked Questions
What is the difference between PX and REM?
Pixels (PX) are fixed-size units. REM (Root EM) is a relative unit that scales based on the browser's root font size. Using REM is a best practice for responsive web design.
Why should I use REM instead of PX?
REM units are essential for **accessibility**. When users change their browser font size, a site built with REM scales proportionally, while PX units stay locked.
Is the conversion data stored?
No. This tool runs entirely in your browser. No data is sent to our servers, making it private and secure for your workflow.
How do I calculate REM manually?
The formula is simple: $$REM = \frac{Pixels}{Base Size}$$. For example, if your base font size is 16px, then 32px is equivalent to 2rem.
