REM to PX Converter
Use the REM to PX converter to convert relative REM units into pixel values, enabling accurate spacing and sizing from design to code.
What are REM and PX Units?
REM (Root EM) is a relative CSS unit calculated from the root font size of the document. It is commonly used to create scalable and accessible layouts.
Pixels (px) are absolute units that represent fixed measurements on the screen. Designers often prefer pixels when working with exact spacing, borders, or design mockups.
Converting REM to PX helps bridge the gap between flexible CSS layouts and fixed design requirements.
Why Convert REM to PX?
While REM is excellent for scalability, there are many cases where pixel values are still required.
- Matching exact values from design tools like Figma or Photoshop
- Debugging layout and spacing issues
- Working with legacy CSS or third-party libraries
- Setting fixed borders, shadows, or small UI elements
- Communicating precise measurements with designers
How to Use the REM to PX Converter
Using our REM to PX calculator is quick and straightforward:
- Enter the REM value you want to convert.
- Specify the root font size used in your project.
- The calculator instantly shows the equivalent PX value.
- Copy the result and apply it to your CSS.
Our REM to PX converter helps you switch between scalable and fixed units without manual calculations.
REM to PX Conversion Formula
The formula used for converting REM to PX is:
PX = REM × Base Font Size
If your root font size is 16px, each REM unit will scale accordingly.
REM to PX Conversion Examples
Here are some examples using a base font size of 16px:
- 1rem × 16 = 16px
- 1.25rem × 16 = 20px
- 1.5rem × 16 = 24px
- 2rem × 16 = 32px
Use Cases
REM to PX conversion is especially helpful in real-world development scenarios:
- Translating scalable CSS values into fixed measurements
- Aligning CSS with pixel-based design systems
- Inspecting layouts during development
- Fine-tuning spacing and alignment
- Maintaining consistency in mixed-unit projects
REM vs PX: Key Differences
REM units scale with the root font size, making them flexible and accessible. PX units remain constant regardless of user settings.
Many developers use REM for typography and spacing while relying on PX for borders, icons, and other elements that require fixed dimensions.
Frequently Asked Questions (FAQs)
What base font size should I use for conversion?
Most browsers use 16px by default, but you should use the value defined on your html element.
Will converting REM to PX affect responsiveness?
Pixel values are fixed, so replacing REM with PX may reduce responsiveness if used excessively.
Is REM supported by all browsers?
Yes, REM units are fully supported by all modern browsers.
Can I mix REM and PX in one stylesheet?
Yes. Mixing units is common and often recommended depending on the design needs.
Why do design tools use pixels instead of REM?
Design tools rely on fixed measurements for accuracy, which is why pixel values are commonly used.
Disclaimer: REM to PX values depend on the root font size defined in your CSS. Results may vary if the base font size is customized or changed dynamically.