Reviewed
40A vs 40B
40B is bigger than 40A. Same band, and 40B has the larger cup letter, so it holds more.
Side by side
| 40A | 40B | |
|---|---|---|
| Relationship | Same band, different cup | |
| UK | 40A | 40B |
| AU | 18A | 18B |
| EU | 90A | 90B |
| FR | 105A | 105B |
| Underbust | 40–41 in | 40–41 in |
| Bust | ≈ 41 in | ≈ 42 in |
| Cup volume | 40B holds more | |
On the size chart
40A is marked in ink and 40B is outlined. The yellow diagonal through 40A shows every size with the same cup volume.
A
B
C
D
DD
DDD
G
H
28
30
32
34
36
38
40
42
44
Read each size
Other comparisons
Questions
Is 40A or 40B bigger?
40B is bigger than 40A. Same band, and 40B has the larger cup letter, so it holds more.
Can I wear 40B if I'm a 40A?
Only if the fit check says so. A different cup letter on the same band changes the cup volume, so try both where returns are easy.
What are 40A and 40B in UK sizes?
40A is UK 40A and 40B is UK 40B. In Europe they are 90A and 90B.