CSSUnitTools.org

PX to VW Converter

Convert pixels to viewport width units instantly. Free CSS calculator for responsive web design with live preview, conversion formula, and best practice guidelines.

px
px
vw

(100px ÷ 1920px) × 100 = 5.21vw

Width of the viewport in pixels (e.g., 1920px for desktop)

How to Use Our PX to VW Converter

Converting px to vw is simple with our calculator. Learn how to convert pixels to viewport width units for responsive web design in three easy steps.

1

Set Viewport Width

Enter the viewport width in pixels. This is typically 1920px for desktop, 768px for tablets, or 375px for mobile devices.

2

Enter Pixel Value

Type the pixel value you want to convert. The converter accepts whole numbers and decimals for precise measurements.

3

Get VW Result

The converter instantly calculates the vw value. Copy the result and use it in your CSS for responsive, viewport-based layouts.

PX to VW: Understanding the Difference

Before using our px to vw converter, learn the key differences between pixels and viewport width units for responsive design and fluid layouts.

What are Pixels (PX)?

Fixed Size Unit

Pixels are absolute units that stay the same size regardless of viewport size. 100px is always 100px.

Limited Flexibility

Pixel-based widths don't adapt to different screen sizes, making responsive design more challenging.

Best Use Cases

Ideal for borders, fixed-width elements, and designs where precise control is required.

What are Viewport Width (VW) Units?

Relative to Viewport

1vw equals 1% of the viewport width. On a 1920px screen, 1vw = 19.2px. The size automatically scales with the viewport.

Truly Responsive

VW units automatically adjust based on screen size - perfect for truly responsive typography and layouts that scale proportionally.

Responsive Design Benefits

VW-based layouts scale seamlessly across all device sizes, from mobile to ultra-wide monitors.

PX to VW Conversion Formula

vw = (Pixels ÷ Viewport Width) × 100

Viewport Width is the width of the browser window in pixels

Example: 100px ÷ 1920px × 100 = 5.21vw

Example: 50px ÷ 1920px × 100 = 2.60vw

Example: 200px ÷ 1920px × 100 = 10.42vw

Step-by-Step Calculation Example

Step 1: Identify pixel value → 150px

Step 2: Identify viewport width → 1920px

Step 3: Divide pixels by viewport width → 150 ÷ 1920 = 0.0781

Step 4: Multiply by 100 → 0.0781 × 100 = 7.81vw

Result: 150px = 7.81vw on a 1920px viewport

PX to VW Conversion Tables

Quick reference tables for common pixel to vw conversions. Use these as a guide for your responsive designs across different viewport widths.

Desktop: 1920px

PixelsVW
50px2.60vw
100px5.21vw
150px7.81vw
200px10.42vw
300px15.63vw
400px20.83vw

Tablet: 768px

PixelsVW
50px6.51vw
100px13.02vw
150px19.53vw
200px26.04vw
300px39.06vw
400px52.08vw

Mobile: 375px

PixelsVW
20px5.33vw
50px13.33vw
100px26.67vw
150px40.00vw
200px53.33vw
300px80.00vw

💡Pro Tip: Using Conversion Tables

These reference tables are perfect for quick lookups when building responsive layouts. Remember that vw values are always relative to the viewport width - choose the table that matches your target device size. For custom values, use our converter tool above.

Real-World CSS Examples

See how to use pixel to vw conversion in real CSS code for common responsive design scenarios.

❌ Fixed Width (Pixels)

.container {
  max-width: 1200px;
  padding: 60px 20px;
}

.hero-title {
  font-size: 48px;
  margin-bottom: 24px;
}

.card {
  width: 300px;
  padding: 20px;
}

This fixed-width layout doesn't scale with the viewport and may look disproportionate on different screen sizes.

✓ Responsive (VW Units)

.container {
  max-width: 100%;
  padding: 3.13vw 1.04vw;
}

.hero-title {
  font-size: 2.5vw;
  margin-bottom: 1.25vw;
}

.card {
  width: 15.63vw;
  padding: 1.04vw;
}

This responsive layout scales proportionally with the viewport, providing a consistent visual experience across all screen sizes.

Responsive Typography

/* Desktop viewport: 1920px */
h1 {
  font-size: 3.13vw; /* 60px */
}

h2 {
  font-size: 2.08vw; /* 40px */
}

p {
  font-size: 0.83vw; /* 16px */
  line-height: 1.5;
}

Typography scales smoothly across devices, maintaining readability and visual hierarchy at any screen size.

Fluid Spacing System

/* Based on 1920px viewport */
.section {
  padding-top: 5.21vw;    /* 100px */
  padding-bottom: 5.21vw; /* 100px */
}

.card-grid {
  gap: 2.08vw; /* 40px */
}

.button {
  padding: 0.83vw 2.08vw; /* 16px 40px */
}

Spacing scales proportionally, ensuring consistent visual rhythm across different viewport sizes.

⚠️Common Mistakes to Avoid

×

Using VW for Small Elements

Avoid vw for borders, icons, or small UI elements that should remain consistent. Use pixels or rem instead.

×

No Min/Max Constraints

Always use min() or max() functions to prevent text from becoming too large or too small: font-size: min(2.5vw, 48px)

×

Ignoring Accessibility

VW units don't respect user font size preferences. Consider using clamp() with rem units for accessible scaling.

×

Horizontal Scrollbar Issues

VW includes scrollbar width on some browsers. Use dvw (dynamic viewport width) or add overflow-x: hidden when necessary.

Modern CSS Solutions: Using VW Safely

Learn how to use viewport units with clamp(), min(), and max() functions for accessible, responsive designs that work perfectly across all devices.

🎯 clamp() Function - Best Practice

The clamp() function sets a minimum, preferred, and maximum value. This ensures text never becomes too small or too large, solving the main accessibility issue with vw units.

/* Responsive font size with limits */
h1 {
  font-size: clamp(24px, 3.13vw, 60px);
  /* min: 24px, preferred: 3.13vw, max: 60px */
}

.hero-text {
  font-size: clamp(1rem, 2.5vw, 3rem);
  /* Scales between 16px and 48px */
}

.container {
  padding: clamp(1rem, 3vw, 4rem);
  /* Responsive padding with constraints */
}

✓ Accessibility Win: Users can still zoom text to 200%, meeting WCAG 1.4.4 requirements while maintaining responsive scaling.

⚡ min() and max() Functions

Use min() to cap maximum size and max() to set minimum size. Great for preventing text from becoming unreadable on mobile or oversized on large displays.

/* Never larger than 48px */
h2 {
  font-size: min(2.5vw, 48px);
}

/* Never smaller than 16px */
p {
  font-size: max(1vw, 16px);
}

/* Responsive width with max limit */
.card {
  width: min(90vw, 800px);
  /* Takes 90% of viewport but never exceeds 800px */
}

💡 Pro Tip: Combine min() and max() with calc() for even more control over responsive sizing.

🔧 Fixing the Scrollbar Problem

100vw includes scrollbar width (~17px on Windows), causing unwanted horizontal overflow. Here are three solutions:

/* Solution 1: Use percentage instead */
.full-width {
  width: 100%; /* Better than 100vw */
}

/* Solution 2: Account for scrollbar */
.section {
  width: calc(100vw - var(--scrollbar-width, 17px));
}

/* Solution 3: Use dvw (dynamic viewport width) */
.modern-full-width {
  width: 100dvw; /* Excludes scrollbar in modern browsers */
}

/* Prevent horizontal scroll entirely */
body {
  overflow-x: hidden;
  max-width: 100vw;
}

Note: dvw, svw, and lvw are newer viewport units with better scrollbar handling, but check browser support before using.

🎨 Hybrid Approach: VW + REM

Combine vw for responsive scaling with rem for accessibility. This respects user font preferences while maintaining proportional layouts.

/* Base font size scales with viewport */
html {
  font-size: clamp(14px, 1vw, 18px);
}

/* All elements use rem (relative to root) */
h1 {
  font-size: 2.5rem; /* Scales with root */
}

p {
  font-size: 1rem;
}

/* Spacing uses calc with both units */
.container {
  padding: calc(1rem + 2vw);
  /* Combines fixed base + viewport scaling */
}

/* Media query adjustments */
@media (max-width: 768px) {
  html {
    font-size: clamp(12px, 2vw, 16px);
  }
}

♿ Accessibility: This approach respects user browser settings while providing responsive scaling - the best of both worlds!

Quick Comparison: When to Use Each Approach

MethodBest ForAccessibilityBrowser Support
Pure VWHero sections, full-width layouts❌ Poor (no zoom support)✓ Excellent
clamp()Typography, responsive spacing✓ Excellent✓ Good (IE not supported)
min()/max()Constraining sizes, preventing overflow✓ Good✓ Good (IE not supported)
VW + REMAccessible responsive typography✓ Excellent✓ Excellent
dvw/svw/lvwModern projects without scrollbar issues⚠ Varies⚠ Limited (newer browsers)

When to Convert PX to VW?

Knowing when to convert px to vw is essential for CSS best practices. Use our px to vw converter for these common scenarios.

Use VW Units For:

  • ✓Hero sections and full-width banners
  • ✓Responsive typography that scales with viewport
  • ✓Fluid spacing and padding systems
  • ✓Elements that should maintain proportions across devices
  • ✓Landing pages with viewport-based designs

Use Pixels For:

  • •Borders and border widths
  • •Box shadows and outline styles
  • •Icons and small UI elements
  • •Media query breakpoints
  • •Elements requiring precise, consistent sizing

PX to VW Conversion FAQ: Common Questions Answered

Get answers to the most common questions about converting px to vw, accessibility concerns, browser compatibility, and best practices for responsive CSS.

How do I convert PX to VW?

To convert px to vw, divide the pixel value by the viewport width and multiply by 100. The formula is: vw = (px ÷ viewport width) × 100. For example, if you have a 100px element on a 1920px viewport: 100 ÷ 1920 × 100 = 5.21vw. Our px to vw converter performs this calculation automatically for you.

What viewport width should I use for conversion?

The viewport width depends on your design target. Common values are 1920px for desktop designs, 768px for tablets, and 375px for mobile devices. Choose the viewport size that matches your primary design breakpoint. Many designers use 1920px as a baseline for desktop-first designs or 375px for mobile-first approaches.

Is VW better than percentage for responsive design?

VW and percentage serve different purposes. VW is always relative to the viewport width (the browser window), while percentage is relative to the parent container. Use vw for elements that should scale with the entire viewport, like hero sections or full-width layouts. Use percentage for elements that should scale relative to their parent container, like multi-column grids within a container.

Can I use VW for font sizes?

Yes, but with caution. VW units for font sizes create truly responsive typography that scales with the viewport. However, always use min() or max() functions to prevent text from becoming too large on wide screens or too small on narrow devices. Example: font-size: min(2.5vw, 48px) or use clamp() for more control: font-size: clamp(16px, 2.5vw, 48px).

What's the difference between VW and REM units?

VW (viewport width) is relative to the viewport size - 1vw = 1% of viewport width. REM (root em) is relative to the root font size, typically 16px by default. VW scales with screen size, while REM scales with user font preferences. For accessibility, REM is better for typography, while VW works well for layout components. Consider combining both: use REM for base sizes and VW for responsive scaling.

Does VW include the scrollbar width?

Yes, on most browsers VW units include the scrollbar width, which can cause minor layout shifts. To avoid this, you can: 1) Use the newer dvw (dynamic viewport width) unit which excludes scrollbars, 2) Use overflow-x: hidden on the body, or 3) Account for ~17px scrollbar in your calculations. Modern CSS also offers svw (small viewport width) and lvw (large viewport width) for more precise control.

How do I prevent VW font sizes from breaking accessibility?

The main accessibility issue with vw units is that they don't respect user zoom preferences, potentially violating WCAG 1.4.4 (Resize text). Always wrap vw values in clamp() with pixel or rem limits: font-size: clamp(16px, 2vw, 48px). This allows responsive scaling while ensuring users can still zoom text to at least 200% of its original size. For better accessibility, consider combining vw with rem units.

Should I use VW for all my CSS measurements?

No, vw is not a one-size-fits-all solution. Use vw for large layout elements, hero sections, and full-width components that should scale with the viewport. Avoid vw for borders (use px), icons (use px or em), and small UI elements that need consistency. For typography, use clamp() with vw for responsive scaling, but set reasonable min/max values. For spacing, consider a hybrid approach combining rem and vw: padding: calc(1rem + 2vw).

Why is my layout broken when using 100vw?

If you see unwanted horizontal scrollbars when using 100vw, it's because vw includes the scrollbar width (~17px on Windows). The browser calculates 100vw as the full viewport including the scrollbar, but your content area excludes it, creating overflow. Solutions: 1) Use width: 100% instead for full-width elements, 2) Apply overflow-x: hidden to the body, 3) Use calc(100vw - 17px), or 4) Switch to modern units like dvw (dynamic viewport width) in browsers that support it.

What's the difference between vw, dvw, svw, and lvw?

These are all viewport width units with different behaviors: vw (viewport width) is the original unit - 1vw = 1% of viewport width, including scrollbars. dvw (dynamic viewport width) adjusts for dynamic UI elements like mobile browser toolbars. svw (small viewport width) assumes UI is visible (smallest state). lvw (large viewport width) assumes UI is hidden (largest state). The newer units (dvw, svw, lvw) have limited browser support - check compatibility before using in production.

Can I convert vw back to px for specific breakpoints?

Yes, you can override vw values with fixed pixels at specific breakpoints using media queries. This is useful when you want fluid scaling on desktop but fixed sizes on mobile: @media (max-width: 768px) { .title { font-size: 24px; /* overrides vw */ } }. Alternatively, use clamp() which automatically constrains values without needing media queries: font-size: clamp(24px, 5vw, 60px). This gives you responsive scaling with automatic min/max limits.

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