CSS Unit Converter
Convert between CSS units with context awareness: px, em, rem, viewport units, and more for responsive design.
Unit Input & Context
Enter a value and configure context settings
For em, ex, ch
For rem unit
For vw, vmin, vmax
For vh, vmin, vmax
Conversion Results
Converted values in all CSS unit formats
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CSS Unit Guide
Absolute Units
- px: Screen pixels (most common for web)
- pt: Points, 1/72 inch (print design)
- pc: Picas, 12 points (typography)
- in/cm/mm: Physical measurements
Relative Units
- em: Relative to element's font-size
- rem: Relative to root font-size
- ex: Height of lowercase 'x'
- ch: Width of '0' character
Viewport Units
- vw: 1% of viewport width
- vh: 1% of viewport height
- vmin: 1% of smaller dimension
- vmax: 1% of larger dimension
Best Practices
- • Use rem for font sizes (accessibility)
- • Use em for component spacing
- • Use px for borders and shadows
- • Use vw/vh for full-viewport elements
- • Avoid fixed pixel heights when possible
- • Test with different browser zoom levels
Responsive Design Tips
- • Combine different unit types strategically
- • Use rem for consistent scaling
- • Use vw for fluid typography
- • Consider clamp() for responsive values
- • Test on various devices and screen sizes
- • Always consider accessibility requirements