CSS Unit Converter
Convert between CSS units: px, rem, em, vw, vh, pt, and percentages. Set base font size for accurate rem/em calculations.
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Smart PicksHow to use CSS Unit Converter
CSS Unit Converter — Convert between CSS units: px, rem, em, vw, vh, pt, and percentages. Set base font size for accurate rem/em calculations. All processing happens instantly in your browser with zero data sent to any server.
- 1Enter your data into the input area at the top of the tool.
- 2Configure any options or settings as needed.
- 3Click the primary action button to process your data.
- 4Copy the result using the Copy button, or download if available.
- 5Use Clear/Reset to start over with new data.
Common Use Cases
- Quick developer tasks without installing software
- Processing sensitive data securely in your browser
- Batch processing when working on multiple projects
- Learning and experimenting with developer concepts
Pro Tips
- All data stays in your browser — safe for confidential content.
- Bookmark this page for quick access from your browser toolbar.
- Check the Related Tools section below for complementary utilities.
Frequently Asked Questions
It converts values between CSS units like pixels (px), rem, em, viewport width (vw), viewport height (vh), and points (pt).
Enter your pixel value, set the base font size (default 16px), and get the equivalent rem value instantly. Works for all common CSS units.
Yes, completely free with no limits.
All conversions are done in your browser. No data is transmitted.
The default is 16px, which is the browser default. You can change it to match your project's root font size for accurate rem calculations.
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