CSS Unit Converter
Convert between Px, Rem, Em, and Percentage units. Essential for responsive web design.
Usually 16px
CSS Unit Converter
The CSS Unit Converter is a handy utility for frontend developers. It simplifies the process of converting between absolute units (like pixels) and relative units (like rems and ems).
Understanding CSS Units
- PX (Pixels): An absolute unit.
16pxis always 16 pixels, regardless of the user's settings. Good for borders and shadows, but less flexible for typography. - REM (Root EM): Relative to the root element's (
<html>) font size. If the root size is 16px,1rem= 16px. This is the preferred unit for responsive typography and spacing. - EM: Relative to the font size of the element itself (or its parent).
1em= current font size. Useful for component-level scaling. - % (Percentage): Relative to the parent element's size. Often used for widths and heights.
Why use REMs?
Using REMs ensures that your website respects the user's browser font size settings. If a user increases their default font size for accessibility, a site built with REMs will scale up proportionally, whereas a site built with PXs will remain small.