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PX to REM Converter
Quickly convert CSS px units to rem units.
What is a PX to REM Converter?
A PX to REM Converter is a free online tool that converts pixel (px) values into REM units used in CSS. REM stands for "root em" and is a relative unit based on the root element's font size, typically 16px by default. This converter helps web developers and designers create responsive and accessible layouts by quickly translating fixed pixel values into scalable REM units.
How PX to REM Conversion Works
The conversion formula is straightforward: divide the pixel value by the base font size (default 16px). For example, 24px ÷ 16 = 1.5rem. This tool automates the calculation so you can focus on building layouts instead of doing math.
- Enter the pixel value you want to convert.
- The tool divides it by the base font size (16px by default).
- The equivalent REM value is displayed instantly.
- Copy the result and use it directly in your CSS.
Why Use REM Units Instead of Pixels?
Using REM units improves accessibility and responsiveness. When users change their browser's default font size, REM-based layouts scale proportionally while pixel-based layouts remain fixed. This makes your website more user-friendly for people with visual impairments and ensures consistent scaling across devices.
PX to REM Conversion Table
| Pixels (px) | REM (base 16px) |
|---|---|
| 8px | 0.5rem |
| 12px | 0.75rem |
| 14px | 0.875rem |
| 16px | 1rem |
| 18px | 1.125rem |
| 20px | 1.25rem |
| 24px | 1.5rem |
| 32px | 2rem |
| 48px | 3rem |
| 64px | 4rem |
Best Practices for Using REM in CSS
- Set a consistent base font size on the
<html>element. - Use REM for font sizes, margins, padding, and spacing.
- Combine REM with media queries for fully responsive designs.
- Keep pixel units for borders, box shadows, and fine details.
- Test your layout with different browser zoom levels.
FAQs
1. What is the default base font size for REM?
The default base font size in most browsers is 16px. So 1rem equals 16px unless the root font size is changed.
2. What is the difference between REM and EM?
REM is relative to the root element's font size, while EM is relative to the parent element's font size. REM provides more predictable scaling.
3. Should I use REM or PX for responsive design?
REM is preferred for responsive design because it scales with the user's browser settings, improving accessibility and flexibility.
4. How do I convert 24px to REM?
Divide 24 by the base font size (16): 24 ÷ 16 = 1.5rem.
5. Is this PX to REM Converter free?
Yes, this tool is completely free with no registration or installation required.