DD cup bra size
DD stands for a difference of 5 in (12.7 cm) between bust and band in US sizing, and a 5 in difference in UK and AU/NZ sizing.
In US sizing a DD cup is a difference of 5 in (12.7 cm) between bust and band.
DD at 5 in, system by system
A cup letter stands for a difference between bust and band. The same letter sits at a different difference in some systems.
| System | Difference (in) | Difference (cm) | Written as |
|---|---|---|---|
| US | 5 | 12.7 | DD/E |
| UK | 5 | 12.7 | DD |
| EU | Not used | Not used | Not used |
| FR/BE | Not used | Not used | Not used |
| AU/NZ | 5 | 12.7 | DD |
| JP | Not used | Not used | Not used |
| EU method (cm) | Measured in cm | Not used | Not used |
Where sources disagree about DD
- US letters: most charts print DD/E, DDD/F and DDDD/G, and some US brands use other sequences between D and H.
9 sizes carry a DD cup
Every size page that has this cup.
US charts print DD/E, while UK and AU/NZ charts print DD; all three assign DD a 5 in difference. The US figure also gives 12.7 cm, and the number differs in the EU method, which has no DD letter.
In US, UK, and AU/NZ sequences, D comes before DD. DDD/F follows it in US charts, while E follows DD in UK and AU/NZ charts; EU, FR/BE, and JP charts omit DD. JP letters vary by brand, and the chart lists them for only part of the range.
The EU method has no DD in its centimetre sequence: AA, A, B, C, D, E, F, G, H. DD has no EU letter or range in this method.
For band 32, DD corresponds to a bust of 36.5 to 37.5 in (92.7 to 95.3 cm), and for band 34, 38.5 to 39.5 in (97.8 to 100.3 cm). For band 36, the figure is 40.5 to 41.5 in (102.9 to 105.4 cm), and for band 38, 42.5 to 43.5 in (108 to 110.5 cm).
Published charts differ on DD's US neighbors: one shows DD/E before DDD/F, while another lists E after DD. DD is also printed as a combined DD/E entry in one US chart but as DD alone in another; UK and AU/NZ put D before DD and E after it.
Questions
What does a DD cup mean?
A DD cup is a difference of 5 in (12.7 cm) between bust and band in US sizing. The letter names the size of that difference.
Which difference is a DD cup in each system?
US 5 in, UK 5 in, EU does not use it, FR/BE does not use it, AU/NZ 5 in and JP does not use it.
Do all systems write a DD cup the same way?
Not everywhere. In US sizing it is 5 in, and EU (not used), FR/BE (not used) and JP (not used) differ.