REM to PX Converter
Easily convert between REM and PX units for responsive web design
Conversion Results
Common Values
📖 Understanding REM and PX
What is REM?
REM (Root EM) is a relative unit that's based on the font-size of the root element (usually the <html> tag). If the root font-size is 16px, then 1rem = 16px.
REM units are great for responsive design because they scale with the root font size, making it easier to adjust sizing across an entire site by changing one value.
What is PX?
PX (Pixels) are absolute units that represent a single dot on a screen. They provide precise control but don't scale when users change their browser's default font size.
While pixels give you exact control, they can create accessibility issues for users who need larger text sizes.
When to Use Each
- Use REM for font sizes, spacing, and most layout measurements to ensure accessibility and responsiveness
- Use PX for borders, fixed-size elements, or when you need pixel-perfect precision
- Best practice is to set your root font-size in pixels (e.g.,
html { font-size: 16px; }) then use REM units throughout your CSS
🌐 Browser Support
REM units are supported in all modern browsers, including:
Note: All versions of modern browsers released in the last decade support REM units.
Note: This converter provides exact mathematical conversions between REM and PX units. The actual rendered size may vary slightly based on browser rendering and rounding.