CSS Unit Converter

How to use

1. 1. Enter or paste your data in the input area above
2. 2. Adjust settings or options as needed
3. 3. Click the action button or see real-time results
4. 4. Copy the result with the copy button

All processing happens in your browser. Nothing is sent to any server.

About this tool

Convert CSS units between px, rem, em, %, vh, vw, pt, cm, mm, and inches. Set your base font size (default 16px) for accurate rem and em calculations, and your viewport dimensions for vh and vw conversions. The tool shows all 10 unit conversions simultaneously and includes a quick reference table mapping common pixel values to rem equivalents. Essential for responsive web design, converting design mockups (usually in px) to relative units (rem/em for scalability), and ensuring consistent sizing across different screen sizes and user font preferences. The rem unit is recommended for most CSS sizing as it respects user font size preferences for accessibility.

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