Bra size chart and calculator
Enter your band and bust measurements to get your size, then see it converted across US, UK, EU, France and Italy. Full band and cup charts are below.
Band size chart
| US / UK | EU (DE, NL) | FR / ES | Italy | AU / NZ | Underbust (cm) |
|---|---|---|---|---|---|
| 28 | 60 | 75 | 0 | 6 | 58 to 62 |
| 30 | 65 | 80 | 1 | 8 | 63 to 67 |
| 32 | 70 | 85 | 2 | 10 | 68 to 72 |
| 34 | 75 | 90 | 3 | 12 | 73 to 77 |
| 36 | 80 | 95 | 4 | 14 | 78 to 82 |
| 38 | 85 | 100 | 5 | 16 | 83 to 87 |
| 40 | 90 | 105 | 6 | 18 | 88 to 92 |
| 42 | 95 | 110 | 7 | 20 | 93 to 97 |
| 44 | 100 | 115 | 8 | 22 | 98 to 102 |
| 46 | 105 | 120 | 9 | 24 | 103 to 107 |
| 48 | 110 | 125 | 10 | 26 | 108 to 112 |
Cup size chart
| Bust minus band (in) | US cup | UK cup | EU / AU cup |
|---|---|---|---|
| 1 | A | A | A |
| 2 | B | B | B |
| 3 | C | C | C |
| 4 | D | D | D |
| 5 | DD | DD | E |
| 6 | DDD / F | E | F |
| 7 | G | F | G |
| 8 | H | FF | H |
| 9 | I | G | I |
| 10 | J | GG | J |
| 11 | K | H | K |
Bra sizing combines two independent measurements into one label, which is why it feels so complicated. The band number comes from the measurement around your ribcage just under the bust, and the cup letter comes from the difference between that measurement and the fullest part of the bust. Change either measurement and the whole size changes.
On top of that, countries label the same physical bra differently. The US and UK use inch based band numbers, while much of Europe, France and Italy use their own centimetre based numbering, and cup letters diverge above a D cup. The charts and calculator here translate a US size into every major system so a bra that fits at home fits abroad.
Bra size questions
How do I measure my bra size?
Measure snugly around your ribcage under the bust for the band, then loosely around the fullest part of the bust. The band comes from the first number and the cup comes from the difference between the two. The calculator does the maths for you.
What is the difference between US and UK bra sizes?
The band numbers are the same, but cup letters differ above a D. A US DDD is a UK E, and the gap grows for larger cups, so always convert rather than assume the letter is identical.
How does EU bra sizing work?
European band sizes are the underbust measurement in centimetres, so a US 34 band is an EU 75. Cup letters run A, B, C, D, E rather than doubling up letters like DD.
Why does my bra size change between brands?
Cut, fabric stretch and style all affect fit, so the same labelled size can fit differently. Use your measured size as a starting point and try the band one size up or down if needed.
Where these numbers come from
Every row in this chart is anchored to two body measurements in centimetres or inches: the underbust, which sets the band, and the fullest part of the bust, which together with the band sets the cup. The cup letter follows from the difference between bust and underbust, roughly one inch per cup step. Because that difference is rounded twice, once into inches and once into a letter, a measurement close to a boundary can land a size either way.
- ISO 8559-1
- Fixes where and how the underbust and bust measurements are taken. In this chart it gives the underbust and bust columns that the band and cup are read from.
What is not standardised. There is no international standard for bra sizes themselves. The band and cup systems used in the US, UK, EU, France, Italy and Australia are separate conventions that were never harmonised, and brands vary within each of them. Treat every row here as a starting point and check a brand fit before you buy.
Reviewed by Jamey Weber, last checked August 5, 2026. Found an error? Report it and it gets fixed in the changelog. See also the full methodology.
Last reviewed and updated on August 5, 2026. Conversion tables are checked against published international sizing standards.