CSS Unit Converter
Simple converter for px, rem, em, %, pt, pc, in, cm, mm.
About This Tool
The PX to REM Converter tool allows you to quickly convert pixel (px) values into rem units for modern, responsive web design. Whether you’re building layouts, adjusting typography, or fine-tuning spacing, this tool helps you convert values accurately and instantly.
In modern CSS development, rem units are preferred over pixels because they scale relative to the root font size. This makes your website more accessible, responsive, and easier to maintain across different screen sizes and devices.
Pixels (px) are fixed units, while rem units are scalable. By converting px to rem, you ensure better flexibility, improved accessibility, and cleaner CSS architecture.
This tool is perfect for frontend developers, UI/UX designers, WordPress developers, and anyone working with responsive layouts.
How To Use
Enter the pixel (px) value you want to convert.
Set the root font size (default is usually 16px).
Click the Convert button.
Instantly get the rem value ready to use in your CSS.
No installation or registration is required. Fast, simple, and accurate conversion every time.
Still Have Questions?
Pixels (px) are fixed units that do not scale based on user settings, while rem units are relative to the root font size (usually 16px by default). Using rem makes your design more flexible and responsive.
Rem units improve accessibility and responsiveness. Since rem scales with the root font size, users who increase browser font size for readability will experience a better layout compared to fixed pixel values.
Most browsers use 16px as the default root font size. However, this can be changed in CSS or browser settings, which is why the tool allows you to adjust the root size before converting.
Yes. The formula is:
rem = px ÷ root font size
For example, if the root size is 16px, then 32px ÷ 16 = 2rem.