Below is a universal chart but in order to get the best information, always research which sizing method your brand uses for the band measurement.
For example, UK brands use the closest whole even number for your band where classic US brands use the diaphragm measurement plus 2/3 inches. If you wear a UK 36G, add 2" to the band and take 2 cup sizes off the UK size and find the US size which would be a 38G.
