What is 30B bra size equivalent to? Read on to find out the sister sizes of this bra.

30B is not a big bra. In fact, it is considered small given that the average bra size ranges from C to DD. With that said, sometimes a 30B bra won’t fit you properly. For example, you may find that the cups fit but the band is either too loose or too tight. In such a case, you will need to find a 30B bra size equivalent.

What is 30B Bra Size Equivalent?

A 30B bra size is equivalent to a 32A and a 34AA. Surprised that a B cup can be the same size as an A and an AA cup? Well, this is made possible through sister sizing.

Basically, sister size bras are bras that have the same cup size but different band sizes. In the case of 30B, the sister sizes are 32A and 34AA. The 32A and 34AA bras have the same cup size as 30B but their band sizes are larger. Therefore, if a 30B seems to tight, you can size up to either a 32A or even a 34AA.

Check this guide on sister sizes for more information.

Now that we know what 30B bra size equivalents are, let’s answer some more common questions.

Is 30B smaller than 32A?

A 30B bra is 1 band smaller than the 32A. Generally, the difference between the underbust and the overbust denote the cup size alphabet. When the difference is one inch, the cup size is A. When the difference is two inches, the cup size is B.

However, a 30B and 32A are sister sizes, i.e., they have the same cup size but different band sizes. With these two bras, a 32A has a bigger band size than a 30B.

What is a 30B bra size?

A 30B bra size is a small bra size that fits women who measure 26-28 inches on the underbust and between 31-32 inches on the overbust. In terms of centimeters, the underbust measures 61-71 cm while the overbust measures 79-81 cm.

Here is a chart showing 30B bra size measurements:

Is 30B bra size small or medium?

30B falls under the small breasts category. A woman with 30 inches band size is a woman with slender figure and B cup is also not a big cup size.

Is 30B the same as 32B?

No. A 30B is not the same as a 32B. The 30B bra size equivalent would be 32A and 34AA. A 32B is one cup larger than a 30B.

Best 30B Bras

Here are some brands that offer the best 30B bras.

30B Bridal Bra: Evelyn Bra

Available on Brabbly

30B Balconette Bra: Maddona Bra

Available on Brabbly

30B T-shirt Bra: Natori Bliss Perfection T-Shirt Bra

Available on Barenecessities| Amazon| HerRoom

30B Padded Bra: Glow Balcony Bra

Available on Brabbly | Amazon | Barenecessities

30B Push Up Bra: Wacoal Embrace Lace Petite Push Up Bra

Available on Barenecessities | Amazon | HerRoom

See other 30B bras on our store.