It isfrom Wikipedia , and whomever made it does get things wrong (A UK A is 0 inch difference? An AA is -1 inch difference?!? Uhh, no. Also the page mentions nothing about cms built in or that it'll be too big), and they do base it off of the +4 built in the EU system, however the cup letters compared in the chart do hold true. I had some F70 bras recently, and their measurements and cup size matched very well to US and UK 32DD/E bras with simliar shapes.