CSS Units Converter
Convert between CSS units: px, rem, em, pt, vh, vw, %. Customize base font size and viewport dimensions.
How to Use
Enter value
Enter the CSS value to convert.
Set base
Set root font size if needed.
Convert
See all unit equivalents.
Features
Frequently Asked Questions
rem is relative to root font size, em is relative to parent element's font size.
Convert between CSS units like px, em, rem, vh, vw, and percentages. Essential for responsive web design and maintaining consistent typography across your projects.
Did You Know?
The 'px' unit in CSS isn't actually tied to physical pixels! On high-DPI screens, 1 CSS pixel can represent multiple device pixels. This is why designs look crisp on retina displays even when sized in pixels.
Pro Tips
- Rem is relative to root font-size (usually 16px), em is relative to parent
- Use rem for global sizing, em for component-specific scaling
- 1vw = 1% of viewport width, useful for fluid typography
Common Use Cases
- Converting pixel designs to responsive units
- Implementing accessible font scaling
- Creating fluid layouts with viewport units
- Migrating legacy CSS to modern approaches
- Calculating media query breakpoints
Best Practices
- Set a root font-size (usually 62.5% = 10px) for easier rem calculations
- Avoid mixing too many different units in one project
- Test your conversions across different screen sizes
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