Bra Size Calculator & Converter
Enter your underbust and bust measurements to calculate your size, then see it in every system.
Bra band sizes chart
| UK / US band | EU band | FR / ES band | IT band | AU band | Underbust (cm) |
|---|---|---|---|---|---|
| 28 | 60 | 75 | 0 | 6 | 58-62 |
| 30 | 65 | 80 | 1 | 8 | 63-67 |
| 32 | 70 | 85 | 2 | 10 | 68-72 |
| 34 | 75 | 90 | 3 | 12 | 73-77 |
| 36 | 80 | 95 | 4 | 14 | 78-82 |
| 38 | 85 | 100 | 5 | 16 | 83-87 |
| 40 | 90 | 105 | 6 | 18 | 88-92 |
| 42 | 95 | 110 | 7 | 20 | 93-97 |
| 44 | 100 | 115 | 8 | 22 | 98-102 |
| 46 | 105 | 120 | 9 | 24 | 103-107 |
Bra cup sizes chart
| UK | US | EU | FR | AU |
|---|---|---|---|---|
| AA | AA | AA | AA | AA |
| A | A | A | A | A |
| B | B | B | B | B |
| C | C | C | C | C |
| D | D | D | D | D |
| DD | DD / E | E | E | DD |
| E | DDD / F | F | F | E |
| F | G | G | G | F |
| FF | H | H | H | FF |
| G | I | I | I | G |
| GG | J | J | J | GG |
| H | K | K | K | H |
How to measure for a bra
Underbust: wearing a non-padded bra, measure snugly around your ribcage directly under the bust, keeping the tape level.
Bust: measure loosely around the fullest part of your bust.
The band size is your underbust rounded to the nearest even number (in inches). Each inch of difference between your bust and band is one cup size: 1 inch is an A, 2 is a B, 3 is a C, and so on.
Converting between countries
UK and US band sizes are the same, but cups differ from DD upwards: a UK E is a US DDD. European bands are in centimetres (a 34 is a 75) and French and Spanish bands add 15 to that.
Frequently asked questions
What is a 34C in European sizes?
A UK 34C is an EU 75C and a French 90C.
Is a UK DD the same as a US DD?
Yes, but above that they differ: UK E = US DDD/F, UK F = US G.
What is a UK 36DD in US size?
A UK 36DD is a US 36DD (or 36E).