CSS Unit Converter

Convert between pixels (px), rem, and em units. Enter a value in any field to see the conversions.

Pixels

Fixed size unit. 1px = 1 pixel on screen.

Root EM

Relative to root font size (16px). Great for consistent scaling.

Element EM

Relative to parent font size (16px). Cascades with parent.

About CSS Units

px
Pixels

Absolute unit. Always the same size regardless of parent elements. Good for precise control and borders.

rem
Root EM

Relative to root element. Consistent scaling across the entire page. Best for typography and spacing.

em
Element EM

Relative to parent element. Cascades with nested elements. Good for component-based scaling.

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CSS Unit Converter - Convert Between px, rem, and em Online