Cup size by difference
Difference = bust minus band, in inches.
| Difference (in) | US | UK | EU |
|---|---|---|---|
| 0 | AA | AA | AA |
| 1 | A | A | A |
| 2 | B | B | B |
| 3 | C | C | C |
| 4 | D | D | D |
| 5 | DD-E | DD | E |
| 6 | DDD-F | E | F |
| 7 | G | F | G |
| 8 | H | FF | H |
| 9 | I | G | I |
| 10 | J | GG | J |
| 11 | K | H | K |
Sister sizes
Sister sizes share cup volume: go down a band and up a cup, or the reverse. 34C = 32D = 36B.
| Size | Down a band | Up a band |
|---|---|---|
| 32B | 30C | 34A |
| 34C | 32D | 36B |
| 36D | 34DD | 38C |
Cup tips
- Cup volume grows with band size, so a 32D is smaller than a 38D.
- If the cups gape, try a smaller cup; if they overflow, go up.
- Re-measure every 6-12 months.
Frequently asked questions
Is DD the same as E?
In US sizing DD equals E; UK sizing uses DD then E.
What is a D cup?
A 4 in difference between bust and band.
Do cup sizes change with band size?
Yes, the same letter holds more volume on a bigger band.