US to UK bra size
Bands are identical (US 34 = UK 34) and cups match through DD. Above that they split — that's where the mistakes happen. Full chart below.
US to UK cup conversion
| US cup | UK cup |
|---|---|
| A–D | Same (A–D) |
| DD | DD |
| DDD / F | E |
| G | F |
| H | FF |
| I | G |
| J | GG |
The band number never changes between US and UK — only the cup letter, and only above DD. A US 34DDD is a UK 34E; a US 34G is a UK 34F.
Full size examples
| US size | UK size |
|---|---|
| 34C | 34C |
| 34DD | 34DD |
| 34DDD | 34E |
| 34G | 34F |
| 36H | 36FF |
Frequently asked questions
Is a US 34C the same as a UK 34C?
Yes. Bands and cups are identical through the D cup, so a US 34C is a UK 34C.
What is a US DDD in UK sizing?
A US DDD (also written F) is a UK E cup.
Why are UK cups labelled differently?
Above DD, the UK uses E, F, FF, G, GG, while US brands often use DDD, G, H. The bodies are the same; only the labels differ.