Convert CSS percentage (%) values to pixels (px) or pixels to percent instantly. Set a custom parent width and copy the result in one click. Everything runs in your browser: no login, no installation.
CSS percentages are relative to different things depending on the property. width is relative to the parent's width, height to the parent's height, font-size to the parent's font size, and, notably, padding and margin are calculated from the parent's width even for vertical values. This converter handles the most common case, converting % ↔ px relative to the parent element's width.
So 50% is always 'half the parent's width': with an 800px parent, 50% = 400px; with a 1200px parent, 600px. Enter the parent's real width to get an accurate value.
Percent and vw are easy to confuse, but their references differ: % is relative to the parent (container), while vw is relative to the whole viewport. Use % to divide space within a container and vw when something must scale directly with the screen width. This converter is handy for seeing the real pixel value inside a nested layout.
All calculation runs in your browser and your input is never sent to a server.
What it is, who it's for, how it works and why you'd use it.
Percent to Px Converter is a tool that instantly converts CSS percentage (%) values to pixels and back.
It is for front-end developers and designers working with percentage-based and pixel-based sizes in responsive layouts.
Enter a % or px value and set the parent element width; the converted result appears instantly in your browser.
It handles the division and multiplication instantly so you can focus on the layout instead of the arithmetic.