EU centimeter bands convert exactly to UK inch bands — EU 80 is UK 36. Cups match through D; an EU E is a UK DD, an EU F is a UK E, one letter "ahead" of the UK’s own sequence.
The band conversion from EU to UK is the mirror of UK-to-EU and just as exact: EU 65 is UK 30, EU 90 is UK 40, with no rounding or brand variation because both scales describe the same physical band measurement.
For cups, remember the UK inserts DD before it starts using new letters, so it runs one step "behind" the EU letter-for-letter past D: EU E is UK DD, EU F is UK E, EU G is UK F, EU H is UK FF. Treating an EU letter as identical to the same UK letter above D will typically size the cup too small.
| Band (EU) | Band (UK) |
|---|---|
| 60 | 28 |
| 65 | 30 |
| 70 | 32 |
| 75 | 34 |
| 80 | 36 |
| 85 | 38 |
| 90 | 40 |
| 95 | 42 |
| 100 | 44 |
| Cup (EU) | Cup (UK) |
|---|---|
| AA | AA |
| A | A |
| B | B |
| C | C |
| D | D |
| E | DD |
| F | E |
| G | F |
| H | FF |
| I | G |
| J | GG |
| K | H |
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.
EU 75E converts to a UK 34DD — the band converts exactly (75→34) and E in the EU system is DD in the UK system.
No — EU G is a UK F. The UK inserts DD ahead of E, so its lettering shifts by one relative to the EU past cup D.
No — every standard EU band (60–100 cm in 5 cm steps) has an exact UK inch equivalent, so there’s no rounding involved in the band half of the conversion.