PX to Percentage Converter

How to convert Pixels to Percentage in CSS?

Percentage is always calculated in relative to something, right? So, in CSS as well, it is a relative unit to the size of the parent element. Therefore to convert pixels to percentage, you have to divide the pixel value with the size of the parent element (in px) and multiply by 100.

The formula to convert pixels to percentage:

Percentage (%) = Pixels (px) ÷ Size of the parent element (in px) x 100

When should I use percentages instead of pixels in my CSS?

Use percentages whenever you want elements to fluidly resize and adapt to different screen sizes or container dimensions. Percentages are perfect for setting widths, heights, padding, margins and even font sizes responsively. On the other hand, pixels are great when you need a fixed, unchanging size regardless of the container or viewport. Like setting an exact border width.