PX to REM Converter helps you convert fixed pixel values into relative rem units for cleaner, more flexible CSS. This is useful when building responsive layouts, design systems, typography scales, spacing rules, and components that should respect the user's browser font settings.
The default base is 16px, which matches most browsers. If your project changes the root font size on the html element, enter that value first so the conversion matches your CSS.
Type a pixel value in the Pixels field. The tool instantly calculates the rem value using the formula pixels divided by base font size. For example, 24px with a 16px base becomes 1.5rem.
Click the swap button to change direction. Enter a rem value, and the converter will show the matching pixel value. This is helpful when checking existing CSS or translating a design token.
Use the copy button under either field to copy a ready-to-use CSS value, including the unit. You can paste it directly into stylesheets, Tailwind config files, or component code.