PX to REM Converter
Use this free tool to easily convert pixels to REM and REM to pixels. Simply remove the default values and start converting. The base font size is typically set to 16px in most browsers. If you’re unsure, it’s best to leave it as is to ensure accurate results.
Calculation based on a root font-size of 16 pixels.
| Pixels | REM |
|---|
| REM | Pixels |
|---|
PX to REM Converter
The PX to REM Converter is a free online tool that instantly converts pixel (px) values into REM units and vice versa. Simply enter a pixel or REM value, and the converter automatically calculates the equivalent result using your selected root font size. Whether you’re building responsive websites, designing UI components, or writing modern CSS, this tool makes unit conversion fast, accurate, and effortless. :contentReference[oaicite:0]{index=0}
What Is a PX to REM Converter?
A PX to REM Converter is a utility that converts fixed pixel values into scalable REM units. In CSS, 1rem is equal to the font size of the root (html) element, which is typically 16px in most browsers. Using REM units helps create responsive, accessible layouts because elements scale according to the user’s browser settings instead of remaining fixed like pixels. :contentReference[oaicite:1]{index=1}
| Pixels | REM |
|---|---|
| 16px | 1rem |
| 20px | 1.25rem |
| 24px | 1.5rem |
| 32px | 2rem |
| 48px | 3rem |
Features
- Convert PX to REM instantly.
- Convert REM back to pixels.
- Supports custom root font sizes.
- Real-time conversion results.
- Simple and beginner-friendly interface.
- Responsive and mobile-friendly.
- No registration or installation required.
- Works in all modern web browsers.
How to Use the PX to REM Converter
- Enter a value in the Pixels or REM field.
- Select your preferred root font size if needed.
- View the converted value instantly.
- Copy the result.
- Use it directly in your CSS stylesheet.
Why Convert PX to REM?
REM units make websites more scalable and accessible by allowing layouts and typography to adapt to browser settings. Unlike pixels, which are fixed, REM values automatically scale when the root font size changes. This makes REM the preferred unit for responsive typography, spacing, and modern frontend development. Pixels are still useful for borders, icons, and other elements that require fixed dimensions. :contentReference[oaicite:2]{index=2}
Browser Compatibility
The converter works perfectly in Chrome, Firefox, Edge, Safari, Opera, and other modern browsers. Since all calculations are performed directly in your browser, conversions are fast, accurate, and secure without sending any data to external servers.
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When Should You Use REM Instead of PX?
Use REM for font sizes, margins, padding, spacing, and layouts that should scale with user preferences. Use pixels when you need fixed dimensions, such as thin borders, shadows, or small icons. Combining both units appropriately helps create responsive, accessible, and maintainable websites that perform well across different devices and screen sizes. :contentReference[oaicite:3]{index=3}
Whether you’re developing websites with HTML, CSS, Bootstrap, Tailwind CSS, React, Vue, Angular, or WordPress, this free PX to REM Converter helps you convert CSS units quickly and accurately while improving your responsive design workflow.
Frequently Asked Questions
The PX to REM Converter is a free online tool that lets you quickly convert pixel values to REM units and vice versa. This helps maintain consistent typography and layout scaling, especially for responsive designs. The default base font size used is 16px, which matches most browser settings.
REM (Root EM) is a CSS unit relative to the root element’s font size. For example, if the root font size is 16px, 1rem = 16px. REM scales automatically when the root font size changes, making it ideal for responsive typography and flexible layouts.
PX (Pixel) is an absolute unit in CSS representing a single dot on the screen. Pixels are fixed in size and do not scale with the browser’s font settings. PX is ideal for elements that need precise control, like borders or icons, but less flexible for responsive layouts.
REM units offer better accessibility and scalability compared to pixels. They adjust based on the root font size, making your website more responsive across devices and user settings. Pixels remain fixed, which can limit flexibility in responsive designs.
The converter uses a default root font size of 16px. It calculates REM values by dividing pixels by 16 and calculates PX values by multiplying REM by 16. These calculations are updated instantly as you type, and the tool also generates conversion tables for reference.
Yes! The tool can convert any positive value, and the built-in tables include pixel values up to 500px and REM values up to 50rem, providing quick references for a wide range of design needs.
The swap button allows you to quickly switch focus between the PX and REM input fields. This makes it easy to enter a value in one unit and convert it to the other without manually selecting the other field.
Yes. The conversion is precise up to 4 decimal places, ensuring accurate sizing in your CSS. It is based on the standard formula: rem = px / 16 and px = rem × 16.
Yes. REM values are relative to the root font size. If your CSS sets a different root size (e.g., 20px), then 1rem = 20px, and the converted values will differ. The converter uses 16px by default, which is standard in most browsers.
Absolutely. The converter includes PX to REM and REM to PX tables. These allow you to quickly look up conversions without manually typing values, making design work faster and more efficient.