🔥 FireTools

CSS Unit Converter

Convert CSS units between px, rem, em, pt, mm, cm, and inches. Essential for responsive design.

Local processing

How to Use

Enter your input above. The result updates automatically. Use the copy button to copy the result.

Privacy

All processing happens in your browser. Your data is never uploaded to any server.

FAQ

What is the base font size?

We use 16px as the default root font size for rem/em calculations.

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