Bra cup size chart
In a size like 36B, 36 is the band size in inches and B means the bust is about 2 in (5 cm) larger than the band. Each cup letter adds about 1 in.
| Difference | US cup | UK cup |
|---|---|---|
| Under 1 in | AA | AA |
| 1 in (2.5 cm) | A | A |
| 2 in (5.1 cm) | B | B |
| 3 in (7.6 cm) | C | C |
| 4 in (10.2 cm) | D | D |
| 5 in (12.7 cm) | DD / E | DD |
| 6 in (15.2 cm) | DDD / F | E |
| 7 in (17.8 cm) | G | F |
| 8 in (20.3 cm) | H | FF |
What to know
Measure snugly around the rib cage just under the bust for the band, then around the fullest part of the bust. Fitting methods differ between brands and countries, so a professional fitting is the most reliable guide.
Cup size is relative to the band: a 34C and a 36B hold about the same volume (called sister sizes).
Questions people ask
What does 36B mean?
A 36 in band with a bust about 38 in, or 2 in larger than the band.
What is 36B in European sizing?
Usually 80B: European bands are in centimeters, with 80 matching a 36 in band.
Related sizes
Sources and method
- Standard US/UK cup progression by bust–band difference
Imperial and metric values are converted with 1 in = 25.4 mm exactly and rounded only for display. Found a mistake? Report it and we will correct the page.