The PX to VW Converter turns pixels into viewport width (vw) units for fluid, responsive design. One vw equals 1% of the viewport width, so elements sized in vw scale automatically with the screen.
vw is how you make something size itself to the browser window rather than a parent element — full-bleed sections, fluid headings, and spacing that grows on large displays. Enter a pixel value and your target viewport width, and the converter gives you the vw equivalent (and back).
How to convert px to vw
- Enter the pixel value.
- Enter the viewport width (for example 1920px).
- Read the vw value; it also converts vw back to px.
The px to vw formula
vw = (px ÷ viewport width) × 100. For 100px on a 1000px-wide viewport, that’s (100 ÷ 1000) × 100 = 10vw.
Fluid typography with vw
Sizing text in vw makes it grow and shrink with the window, which is great for hero headings — but pure vw gets too small on phones and too large on wide monitors. The modern fix is clamp(), for example font-size: clamp(1.5rem, 4vw, 3rem), which sets a minimum, a fluid vw-based ideal, and a maximum. Convert your target pixel size to vw here to find the middle value, then wrap it in clamp() with sensible bounds.
A vw gotcha to watch
On most desktop browsers 100vw includes the space taken by a vertical scrollbar, so an element set to width: 100vw can be slightly wider than the visible area and cause a horizontal scroll. Prefer 100% for full-width blocks, and reserve vw for cases where sizing relative to the viewport is genuinely what you want. Test at several widths, since vw values behave very differently on mobile and desktop.
Frequently Asked Questions
How do I convert px to vw?
Divide the pixel value by the viewport width and multiply by 100. 100px on a 1000px viewport is 10vw.
What viewport width should I use?
Use the design width you’re targeting, such as 1920px for desktop or 375px for mobile.
When should I use vw units?
Use vw for elements that should scale with the screen width, like fluid headings and full-width sections.