VH To VW Converter

Master Viewport Units for Responsive Design

Converting between vh (viewport height) and vw (viewport width) is essential when you need to maintain aspect ratios, translate vertical measurements to horizontal ones, or create layouts that respond proportionally to viewport dimensions. Unlike conversions involving font sizes, vh to vw conversion is purely geometric, it depends entirely on your viewport's aspect ratio.

This converter helps you understand how vertical measurements relate to horizontal ones across different screen sizes. Whether you're building full-screen hero sections, maintaining video aspect ratios, or creating responsive grids, accurate vh to vw conversion ensures your designs work beautifully across all devices.

How This vh to vw Converter Works

Our vh to vw converter calculates the relationship between viewport height and width based on your specified dimensions. The formula is straightforward: convert vh to pixels using the viewport height, then convert those pixels to vw using the viewport width.

For example, 50vh on a 1920×1080 viewport: (50 × 1080) / 100 = 540px, then (540 / 1920) × 100 = 28.125vw. The same 50vh on a mobile device (375×667) would be 88.93vw, a dramatic difference that shows why aspect ratio matters so much in viewport unit conversions.

Real-Time Conversion with Instant Results

As you type a vh value, the corresponding vw value updates instantly. This real-time feedback helps you understand how vertical measurements translate to horizontal ones across different viewport configurations. Adjust the viewport width or height, and watch the conversion recalculate immediately.

Customizable Viewport Dimensions

The relationship between vh and vw depends entirely on viewport dimensions. Our converter lets you specify both width and height to match your target devices. It defaults to 1920×1080 (desktop), but you can change these to any values, 375×667 for mobile, 1024×768 for tablets, or any custom dimensions you need.

Quick Viewport Presets

Instead of manually entering dimensions, use our preset buttons for common screen sizes: 1920×1080 (Full HD desktop), 1440×900 (laptop), 1366×768 (common laptop), and 375×667 (iPhone). Click any preset to instantly see how your vh value converts on that specific viewport configuration.

Bidirectional Conversion

Need to work backwards? Click the swap button to reverse the conversion direction, instantly turning the tool into a vw to vh converter. This flexibility lets you work in whichever direction makes sense for your current design task, without needing separate tools.

Adjustable Decimal Precision

Control how many decimal places appear in your results (0-4 decimals). The default is 2 decimal places for clean, readable values. Increase precision for exact measurements or decrease it for simpler CSS numbers.

One-Click Copy to Clipboard

Once you have the perfect conversion, click the copy button to instantly place the value on your clipboard. A confirmation checkmark appears, and you're ready to paste into your CSS file, no manual selection or retyping needed.

When to Convert vh to vw in Your Projects

Maintaining Aspect Ratios

The primary use case for vh to vw conversion is maintaining specific aspect ratios in responsive designs. When you want an element to maintain 16:9, 4:3, or any other aspect ratio regardless of screen size, you need to express dimensions in compatible units. Converting between vh and vw helps you calculate the correct proportions.

For instance, creating a video container that maintains 16:9 proportions requires understanding how height relates to width. Use our vh to vw converter to find what vertical measurement gives you the proportions you need on different viewport sizes.

Full-Screen Hero Sections

Hero sections often use viewport units for dramatic full-screen effects. While 100vh seems like the obvious choice for height, converting to vw can help you create hero sections that maintain better proportions across different screen orientations and aspect ratios, especially on ultra-wide monitors or mobile devices in landscape.

Responsive Grid Systems

When building grids where vertical spacing should relate proportionally to horizontal spacing, converting between vh and vw helps ensure consistent proportions across breakpoints. This is particularly useful for photo galleries, masonry layouts, and card grids that need to maintain visual balance across different screen sizes.

Diagonal and Creative Layouts

Creating diagonal sections, rotated elements, or designs positioned at angles often requires converting between vh and vw to calculate proper dimensions that work across different viewports. Our converter helps you determine the correct measurements for these creative layouts.

Best Practices for vh to vw Conversion

Account for Mobile Browser Chrome

Mobile browsers have a notorious issue with vh units, the address bar and bottom navigation affect the actual viewport height. 100vh often results in content being cut off. When converting vh to vw for mobile layouts, always test on real devices and consider using newer units like dvh (dynamic viewport height) or adding JavaScript-based fallbacks.

Test Across Different Aspect Ratios

The vh to vw relationship changes dramatically across different aspect ratios. Use our preset buttons to test conversions at 1920×1080, 1440×900, 1366×768, and 375×667. If the vw results vary wildly, you need to use CSS min(), max(), or clamp() to constrain values appropriately.

Combine with CSS Functions

Raw vh or vw values rarely work perfectly across all devices. After using our converter to find base values, wrap them in CSS functions for better control. For example: height: clamp(200px, 28.125vw, 600px). This ensures elements scale proportionally while staying within reasonable bounds.

Consider Orientation Changes

When devices rotate from portrait to landscape, vh and vw values completely swap their relationship. Test your conversions with both orientations, 375×667 for portrait mobile, then 667×375 for landscape. This reveals whether your layout will break on orientation change.

Common vh to vw Conversion Scenarios

Creating a 16:9 Video Container

You want a video container spanning full viewport width (100vw) that maintains 16:9 aspect ratio. The height should be 56.25vw. Use our converter to understand what vh value equals your target vw on different viewports. On 1920×1080, you'd need 100vh, but on mobile (375×667) you'd need approximately 31.59vh.

Building Height-Based Square Elements

Creating square elements where both dimensions are based on viewport height (width: 20vh, height: 20vh)? Use our converter to find the vw equivalent. On 1920×1080, 20vh equals 11.25vw, helping you understand how much horizontal space your vh-based squares will consume.

Responsive Vertical Spacing

Designing a full-height dashboard with sections that have spacing proportional to viewport height? Your gap might be 5vh, but converting to vw shows how this relates to horizontal measurements. On 1920×1080 it's 2.8125vw, but on mobile 375×667 it's 8.89vw, a dramatic difference showing why height-based spacing behaves differently across aspect ratios.

Technical Details: The Math Behind vh to vw

Understanding the conversion mathematics helps you predict layout behavior across viewports. vh (viewport height) equals 1% of viewport height. On 1080px tall viewport, 1vh = 10.8px. Formula: pixels = (vh × viewport-height) / 100.

vw (viewport width) equals 1% of viewport width. On 1920px wide viewport, 1vw = 19.2px. Formula: vw = (pixels / viewport-width) × 100.

Our converter combines these: vw = ((vh × viewport-height) / viewport-width). For example, 50vh on 1920×1080: ((50 × 1080) / 1920) = 28.125vw. The tool performs this calculation instantly as you adjust values.

Troubleshooting Common Issues

Issue: Converted values look wrong on actual devices. Solution: Check actual viewport dimensions using browser DevTools (window.innerWidth and window.innerHeight) and update the converter accordingly.

Issue: Layout breaks when rotating device. Solution: Test conversions with both width×height and height×width configurations, or use CSS aspect-ratio property instead of manual vh/vw conversions.

Issue: Mobile vh values don't account for browser chrome. Solution: Consider using dvh (dynamic viewport height) or svh (small viewport height) units, or implement JavaScript-based viewport height detection.

Start Converting vh to vw Today

You now understand how to convert vh to vw units and why these conversions matter for responsive design. Whether you're maintaining aspect ratios, building viewport-relative layouts, or translating measurements between dimensions, this vh to vw converter provides accurate calculations instantly.

The tool above is completely free, requires no signup, and delivers instant results with full control over viewport dimensions. Use preset buttons for quick testing, swap conversion direction as needed, adjust decimal precision to your preference, and copy results to your clipboard with one click.

Remember: viewport units are powerful but require careful implementation. Always test converted values across multiple devices and aspect ratios, use CSS functions to add appropriate bounds, and consider mobile browser chrome issues. Convert with confidence, test thoroughly, and build responsive layouts that work beautifully on any screen!

Last Updated: 10/12/2025 | Version 1.0