Active Admin is a Ruby on Rails plugin for generating administration style interfaces. It abstracts common business application patterns to make it simple for developers to implement beautiful and elegant interfaces with very little effort.
Do you have a width, let’s say 200, and want to know the height you need for a Golden Rectangle, 16x9, 3x2, and other common ratios? Then enter your width and press Get Ratio. You can enter your own ratio as well!