An EU band in centimeters converts straight back to a US inch band — EU 80 is a US 36. Cup letters match the US through D; above that, an EU E is a US DD, not a US E.
Going from EU to US, start with the band: EU bands are already centimeter values in 5 cm steps (60 through 100), and each one has a single, unchanging US equivalent — EU 70 is US 32, EU 85 is US 38, and so on. There's no rounding ambiguity because the two scales were built to line up exactly.
Cup letters are the part that trips people up. A through D read identically in both systems. But an EU E is not a "US E" — it's a US DD (some US brands also print it as E, which this converter accounts for). An EU F is a US DDD, and an EU G is a US G again (some US brands print that one as DDDD). Matching the letter itself past D is the single most common EU-to-US bra mistake.
| Band (EU) | Band (US) |
|---|---|
| 60 | 28 |
| 65 | 30 |
| 70 | 32 |
| 75 | 34 |
| 80 | 36 |
| 85 | 38 |
| 90 | 40 |
| 95 | 42 |
| 100 | 44 |
| Cup (EU) | Cup (US) |
|---|---|
| AA | AA |
| A | A |
| B | B |
| C | C |
| D | D |
| E | DD / E |
| F | DDD / F |
| G | G / DDDD |
| H | H |
| I | I |
| J | J |
| K | 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.
EU 75E converts to a US 34DD (also printed as 34E by some US brands) — band 75→34 is exact, and E→DD is the cup-letter divergence above D.
Yes, band sizes convert one-to-one — EU 70 is always a US 32 band, regardless of brand.
US and EU cup letters share the same alphabet only through D. An EU F is a US DDD, because the two systems add letters differently once a bra runs larger than a D cup.