CSS vw Unit Converter

Convert px to viewport-width vw units, or the reverse.

Category: Dev Tools

When to use?

Use it in responsive design to use viewport-based vw instead of fixed px, or to convert design px values to vw.

How to use

  • Enter the base viewport width (e.g. 1440).
  • Enter px to get vw, or vw to get px.
  • Copy the result for your CSS.

Input Explanation

Enter the design's full viewport width (e.g. mobile 375, desktop 1440) and the element's pixel size to convert.

Calculation Basis

vw = (px ÷ viewport width) × 100. E.g. at 1440px viewport, 144px → 10vw.

Usage Examples

  • px → vw conversion - Convert design px values to responsive vw units.
  • Responsive font size - Compute reference values when specifying font size in vw.
  • Quick pre-deploy check - Check inputs and output to reduce errors before dev/ops work.

Examples

  • At 1440px viewport: 144px → 10vw
  • At 375px viewport: 37.5px → 10vw

Cautions

  • Generated output is for reference; test carefully before production use.
  • Specific web-standard specs or framework-only syntax may cause compatibility issues.

Guides

What the vw unit is

1vw is 1% of the viewport (browser) width. Use vw instead of px for responsive layouts that scale with screen size.

px-vw formula

To convert px to vw at a resolution: vw = (px / screen width) × 100. Combine with the css-clamp tool for responsive typography with min/max bounds.

FAQ

What is the vw unit?

A CSS unit meaning 1% of viewport width. At 1440px viewport, 1vw = 14.4px.

Can I change the base viewport width?

Yes, enter the viewport width used as the basis.

Can I convert vw back to px?

Yes, it supports both px→vw and vw→px.

Is vw good for responsive design?

It scales with viewport width, useful for responsive text/spacing. Pair with clamp() to limit min/max sizes.

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