How to measure band and bust
Band: measure snugly under the bust. Bust: measure around the fullest part with a relaxed tape. Subtract band from bust and read the cup below. Try the bra size calculator.
Cup size chart by difference
| Difference (in) | US | UK | EU |
|---|---|---|---|
| 0 | AA | AA | AA |
| 1 | A | A | A |
| 2 | B | B | B |
| 3 | C | C | C |
| 4 | D | D | D |
| 5 | DD-E | 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 |
Band size conversion chart
| US | UK | EU | AU | FR/ES |
|---|---|---|---|---|
| 30 | 30 | 65 | 8 | 80 |
| 32 | 32 | 70 | 10 | 85 |
| 34 | 34 | 75 | 12 | 90 |
| 36 | 36 | 80 | 14 | 95 |
| 38 | 38 | 85 | 16 | 100 |
| 40 | 40 | 90 | 18 | 105 |
| 42 | 42 | 95 | 20 | 110 |
Sister sizes
34C = 32D = 36B. Same cup volume, different band.
| Your size | Down a band, up a cup | Up a band, down a cup |
|---|---|---|
| 32B | 30C | 34A |
| 34C | 32D | 36B |
| 36D | 34DD | 38C |
Signs of a wrong fit
- Band rides up the back.
- Cups gape or overflow.
- Center gore does not lie flat.
- Straps dig in or slip off.
Frequently asked questions
How do I calculate my bra size?
Measure under the bust for the band and around the fullest part for the bust. The difference in inches sets the cup: 1 inch is A, 2 is B, 3 is C, 4 is D.
What are sister sizes?
Sister sizes have the same cup volume: go down a band and up a cup (34C to 32D) or up a band and down a cup (34C to 36B).
What if the band rides up?
A band that rides up is too loose. Try a smaller band and a larger cup.
Do UK and US cup letters match?
They match through D. After that, US DD or E equals UK DD, then UK E, F, FF, G, GG, H.