PX to VW / VH Converter

Convert pixel values to viewport width (vw) and viewport height (vh) units for CSS layouts.

Overview

Converts fixed pixel dimensions into responsive Viewport Width (vw) and Viewport Height (vh) units based on target screen mockup resolutions.

Formula & Calculation Method

vw = (px / Viewport_Width_px) × 100 | vh = (px / Viewport_Height_px) × 100

Enables fluid CSS scaling where typography and component sizes scale proportionally with screen viewport width.

Worked Example: Converting 48px Heading on 1440px Desktop Canvas

Inputs: Target Pixels = 48px | Viewport Canvas Width = 1440px

  • Divide pixels by canvas width: 48 / 1440 = 0.03333
  • Multiply by 100: 0.03333 × 100 = 3.333vw
  • CSS declaration: font-size: 3.333vw;

Summary: 48px at 1440px Canvas = 3.333vw | Responsive Scaling Enabled

Common Use Cases

  • Fluid Typography: Create headline fonts that scale smoothly between mobile and desktop screen sizes.
  • Hero Banners: Proportion full-screen landing page headers to match 100vh viewport heights.
  • Aspect Ratio Containers: Build responsive canvas containers that maintain exact layout proportions.

Frequently Asked Questions

What is the difference between vw and %?

vw is always relative to the browser viewport window; % is relative to the size of the immediate parent element.

What are dvh and lvh units in modern CSS?

dvh (dynamic viewport height) adjusts dynamically as mobile browser address bars expand and collapse; lvh reflects the largest possible viewport height.

How do I prevent viewport fonts from scaling too large?

Use CSS clamp(): font-size: clamp(min, preferred_vw, max); to lock minimum and maximum boundaries.

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