What is a normal bra size?

Any bra size is normal, but to give you an idea, the average woman should be wearing a 34DD. Band sizes start from 28 and go up to around 56, and cup sizes start from AA and go up to K. All of these sizes are worn by women with normal, natural breasts. Most people do not wear Bras that fit them however, and the average bra we buy is a 36C. Studies show that at least 80% of women are wearing the wrong bra size, and the most common mistake is to increase the band size (the number) when our breasts grow instead of increasing the cup size (the letter.) This is why DD+ cups are regarded as being very large, when in fact the average woman should be wearing a DD.

The band size refers to the size of your frame excluding your breasts. The correct band size will usually be your underbust/ribcage measurement rounded to the nearest even number, for example if your underbust measures 33 inches you will most likely need a 34.

The cup size (represented by a letter) is relative to the band size so if you currently fill a 36C but you need a 34 band, then a 34C will be too small. You will need to try a 34D - go up one cup size for every band size that you go down.