Convert percentage values to viewport width (VW) and height (VH) units for truly responsive designs that adapt to any screen size.
How Percentage to VW/VH Conversion Works
Viewport units (VW and VH) in CSS are relative to the size of the browser viewport. This tool helps you calculate the viewport unit value that corresponds to a percentage of the viewport dimensions.
The conversion is simple because percentage and viewport units are directly comparable:
1% = 1vw (for width) or 1vh (for height)
Key Definitions:
- 1VW (Viewport Width) = 1% of the viewport's width
- 1VH (Viewport Height) = 1% of the viewport's height
- 1VMIN = 1% of the viewport's smaller dimension
- 1VMAX = 1% of the viewport's larger dimension
Practical Examples:
/* Full width element */
.full-width { width: 100vw; } /* Same as width: 100% */
/* Half viewport height */
.half-height { height: 50vh; } /* Same as height: 50% */
/* Square that's 90% of viewport width */
.square {
width: 90vw;
height: 90vw; /* Maintain aspect ratio */
}
When to Use Viewport Units:
- Creating full-screen sections or hero areas
- Elements that should scale precisely with viewport size
- Responsive typography (using vw for font sizes)
- Maintaining aspect ratios across different screen sizes
- Creating spacing that adapts to viewport dimensions
Important Considerations:
- VW/VH units don't account for scrollbars (can cause horizontal scrolling)
- Mobile browsers handle viewport units differently (address bar affects VH)
- For typography, consider using clamp() with vw units to set minimum/maximum sizes
- Combine with percentage units for more flexible responsive designs