A 70B bra size means that the band measurement around your rib cage is approximately 70 centimeters and the cup size is B. The band measurement corresponds to the numerical size, while the cup size corresponds to the letter. In this case, a 70B indicates that your rib cage measures around 70cm and your bust is about 12-14cm larger than the ribcage.
Many people believe that a larger number in the band size automatically means a bigger bra overall. However, this is not always true. Band sizes are relative to each person’s body frame and can vary widely even within one letter difference in cup size.
An interesting fact about bra sizing is that it was developed by combining measurements for two different aspects of our chest: the ribcage circumference for band sizes and the difference between bust and underbust measurements for cup sizes. Knowing how these two measurements combine will help you understand better how bras fit different bodies.
The next step would be to measure yourself properly so you can find out what bra fits you best according to this system. Remember, comfort should always be a priority when choosing your bras!
| Bra Size | Band Size (cm) | Cup Size |
|---|---|---|
| 70B | 68-72 | Small |
| 70C | 68-72 | Medium |
| 70D | 68-72 | Large |
| 75B | 73-77 | Small |
| 75C | 73-77 | Medium |
| 75D | 73-77 | Large |
| 80B | 78-82 | Small |
| 80C | 78-82 | Medium |
| 80D | 78-82 | Large |
| 85B | 83-87 | Small |