UK and US bands are the same inch scale, so a UK band converts to EU exactly like a US one does — UK 34 is EU 75. Cups match through D, then a UK DD is an EU E, a UK E is an EU F, and so on.
UK and US band sizes are identical (both are inch-based), so the UK-to-EU band conversion is exactly the same lookup as US-to-EU: UK 30 is EU 65, UK 36 is EU 80, UK 40 is EU 90. No brand adjusts this — it's a straight unit restatement.
UK cup letters take their own path past D, and it's a different path from the US one: UK goes DD, E, F, FF, G, GG… while the EU goes E, F, G, H… one letter at a time. That means a UK DD is an EU E, a UK E is an EU F, a UK F is an EU G, and a UK FF is an EU H. Reading a UK cup letter as if it were an EU letter under-sizes the cup the further up the alphabet you go.
| Band (UK) | Band (EU) |
|---|---|
| 28 | 60 |
| 30 | 65 |
| 32 | 70 |
| 34 | 75 |
| 36 | 80 |
| 38 | 85 |
| 40 | 90 |
| 42 | 95 |
| 44 | 100 |
| Cup (UK) | Cup (EU) |
|---|---|
| AA | AA |
| A | A |
| B | B |
| C | C |
| D | D |
| DD | E |
| E | F |
| F | G |
| FF | H |
| G | I |
| GG | J |
| H | K |
Cup letters match through D; above D the systems diverge, which is why the cup half of this chart is a lookup, never a formula.
Yes — band converts exactly (34→75) and UK DD is the EU equivalent of E, one step past where the two systems share letters (through D).
A UK E cup is an EU F. UK adds DD before E, so the UK sequence runs one letter "behind" the EU’s at the same physical size.
The UK cup scale repeats some letters (DD, then E, F, FF, G, GG) instead of adding new ones the way the EU (E, F, G, H…) or US (DD, DDD, G…) do — it’s a separate labelling convention for the same underlying sizes.