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CSS Unit Converter

Convert between px, rem, em, pt, vw, and vh instantly

Base font size:px

rem1Copy

em1Copy

pt12Copy

vw0.8333Copy

vh1.4815Copy

About CSS Unit Converter

The CSS Unit Converter translates between px, rem, em, pt, vw, and vh units instantly. It is free, runs in your browser, and stores no data. An essential tool for front-end developers building responsive websites and ensuring consistent typography across devices.

Frequently Asked Questions

How do I convert between CSS units?

Enter a value in any supported CSS unit and set the base font size if needed. The tool instantly shows the equivalent values in px, rem, em, pt, vw, and vh, making it easy to translate between units for your stylesheets.

Is my data stored during conversion?

No, all conversions happen in your browser. No values or settings are transmitted to any server. The calculator runs entirely on your device with complete privacy.

What is the difference between rem and em?

Both rem and em are relative CSS units. Rem is relative to the root element's font size, typically 16px by default, making it consistent throughout the page. Em is relative to the parent element's font size, so it can compound when nested. Rem is generally preferred for consistent sizing.