Converter Tools
CSS Unit Converter
Convert common CSS units with configurable font size and viewport dimensions.
1 rem
Relative units require explicit context; adjust the fields above as needed.
Relative CSS units need context
rem depends on the root font size, em on the parent font size, vw/vh on viewport dimensions and percent on a chosen base value.
Conversion method
The tool first converts the input to pixels using your context values, then converts pixels to the target unit.