How bra size conversion works
Convert the band and the cup separately. Bands follow a fixed pattern, so a US 34 is a UK 34, EU 75, FR 90 and AU 12. Cups match up to D, then each country names the larger cups differently.
Bra size converter
Pick the size you know and see what it is called in every other country.
Around the world
| System | Size |
|---|---|
| United States and Canada | 34C |
| United Kingdom and Ireland | 34C |
| Europe (Germany and most of the EU) | 75C |
| France, Belgium and Spain | 90C |
| Australia and New Zealand | 12C |
| Italy | III C |
| Japan (approximate) | C75 |
| US | UK | EU | FR | AU | IT |
|---|---|---|---|---|---|
| 28 | 28 | 60 | 75 | 6 | 0 |
| 30 | 30 | 65 | 80 | 8 | I |
| 32 | 32 | 70 | 85 | 10 | II |
| 34 | 34 | 75 | 90 | 12 | III |
| 36 | 36 | 80 | 95 | 14 | IV |
| 38 | 38 | 85 | 100 | 16 | V |
| 40 | 40 | 90 | 105 | 18 | VI |
| 42 | 42 | 95 | 110 | 20 | VII |
| 44 | 44 | 100 | 115 | 22 | VIII |
| 46 | 46 | 105 | 120 | 24 | IX |
Cup conversion chart
Read across a row for the same cup. France, Belgium, Spain and Italy follow the EU column.
| US | UK | EU | AU |
|---|---|---|---|
| AA | AA | AA | AA |
| A | A | A | A |
| B | B | B | B |
| C | C | C | C |
| D | D | D | D |
| DD | DD | E | DD |
| DDD | E | F | E |
| G | F | G | F |
| H | FF | H | G |
| I | G | I | H |
| J | GG | J | I |
| K | H | K | J |
| L | HH | L | K |
Japanese and Italian sizes
Japanese sizes put the cup first, as in C70. Japan's standard measures your actual underbust and uses 2.5 cm cup steps, so the conversion here is an approximation. Italian bands use Roman numerals, from I for EU 65 upward, and Italian cups vary between brands. Check the brand's chart for both.
Conversion questions
Are US and UK bra sizes the same?
The band numbers match, and so do the cups up to DD. After that they split: the next cup is DDD in the US and E in the UK, then G against F. So a UK 34F is a US 34G.
How do I convert a European bra size to US?
Each 5 in a European band is one US band, and EU 75 equals US 34. Cups match up to D, then the EU runs straight through the alphabet: EU E is US DD, and EU F is US DDD.
What is a French bra size?
French, Belgian and Spanish bands are the European number plus 15, so EU 75 is FR 90. The cup letters follow the European ones.
How do Australian bra sizes work?
Australian and New Zealand bands use dress-size numbers: a US or UK 34 is an AU 12. The cups run AA to DD and then E, F, G.
Are converted bra sizes exact?
They are a close starting point. Brands size differently within a country as well as between them, and Japanese and Italian ranges vary most. If a brand publishes its own chart, trust that over any general table.
Keep going
- Bra size calculator
Measure twice with a tape and get your size in every system.
- Bra cup sizes in order
What comes after D, and why letters change between countries.
- Sister size calculator
Find sizes with the same cup volume on a different band.