Bra Size Converter
Convert bra sizes between US, UK, EU, French, Italian, Australian, and Japanese sizing systems. Bra sizing combines a band number and a cup letter, both of which vary by country. Enter your full bra size below for an instant international conversion.
Type a size to convert
Band Size Conversion
The band number represents the underbust measurement and varies across sizing systems. Use the table below to find your equivalent band size.
| US/UK | EU | FR | IT | AU | JP | Underbust (cm) |
|---|---|---|---|---|---|---|
| 30 | 65 | 80 | 0 | 8 | 65 | 63-67 |
| 32 | 70 | 85 | 1 | 10 | 70 | 68-72 |
| 34 | 75 | 90 | 2 | 12 | 75 | 73-77 |
| 36 | 80 | 95 | 3 | 14 | 80 | 78-82 |
| 38 | 85 | 100 | 4 | 16 | 85 | 83-87 |
| 40 | 90 | 105 | 5 | 18 | 90 | 88-92 |
| 42 | 95 | 110 | 6 | 20 | 95 | 93-97 |
| 44 | 100 | 115 | 7 | 22 | 100 | 98-102 |
Cup Size Conversion
Cup letters differ between US, UK, and EU systems, especially above a D cup. The table below shows how cup letters map across systems.
| US | UK | EU / FR / IT / JP |
|---|---|---|
| AA | AA | AA |
| A | A | A |
| B | B | B |
| C | C | C |
| D | D | D |
| DD | DD | E |
| DDD | E | F |
| G | F | G |
| H | FF | H |
| I | G | I |
| J | GG | J |
| K | H | K |
Frequently Asked Questions
How do I convert my US bra size to EU?
To convert a US bra size to EU, you need to convert both the band and the cup. For the band, US 32 = EU 70, US 34 = EU 75, US 36 = EU 80, and so on (add roughly 38 and round to the nearest 5). Cup letters are the same from AA through D, but diverge after that: US DD = EU E, US DDD = EU F. Use the converter above for exact results.
What is the difference between US and UK cup sizes?
US and UK cup sizes are identical from AA through D. They start to differ at DD: the US system goes DD, DDD (or E), G, H, while the UK system uses DD, E, F, FF, G, GG, H. Band numbers are the same in both systems. Always check which system a brand uses before ordering.
How do I measure my bra size correctly?
Measure your underbust (directly below the bust) snugly in centimetres for the band size, and measure around the fullest part of your bust for the cup size. The difference between the two measurements determines your cup: each 2.5 cm of difference is approximately one cup size. Our band conversion table shows the cm ranges for each band size.
Why do French and Italian bra sizes look so different?
French bra sizes add 15 cm to the EU band number (e.g. EU 75 = FR 90), while Italian sizes use a 0-based numbering system (e.g. EU 65 = IT 0, EU 70 = IT 1). Despite the different numbers, they represent the same physical measurements. Cup letters in both systems follow the EU convention.