CSS Calculator gives web designers/front end web developers a way to quickly calculate commonly used values for their CSS properties.
The pixel-to-percentage converter offers a way to simplify time-consuming division that often adds up when dealing with multiple HTML elements. These values can be applied using top, right, left, bottom or margin properties to absolutely-positioned elements.
Hexadecimal-to-RGBA gives designers a way to change a color or background color that suddenly needs opacity applied to it, without needing to switch back-and-forth between desktop applications.
Lastly and perhaps one of the greatest challenges in CSS is determining what a font size value should be. This tool makes converting between px, pt, %, em & rem units a snap.