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CSS unit converter
Convert CSS lengths using explicit font and viewport context.
Numeric CSS length and context dimensions
UTF-8 text
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Your input and output are processed in this browser. They are not uploaded for processing. No account is required.
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How to use this tool
- Enter the numeric value and choose the source and destination CSS units.
- Set the font sizes, viewport dimensions and percentage reference size needed for the conversion.
- Run the tool to review or download the converted length.
Examples
16px with 16px root font → 1rem
Limitations
CSS absolute units use 1in = 96px.
Percentage interpretation depends on the CSS property; supply the correct reference.
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