Enter your band and bust measurements to get your size across US, UK, and EU sizing.
Wearing a non-padded bra (or no bra), wrap a soft tape measure snugly around your ribcage directly under your bust. Keep the tape level and parallel to the floor, and breathe normally — snug but not tight.
Wrap the tape around the fullest part of your bust, roughly across the nipple line. Keep it level and don’t pull it tight — it should lie flat without compressing.
Cup letters at the same band size, across sizing systems.
| US | UK | EU |
|---|---|---|
| AA | AA | AA |
| A | A | A |
| B | B | B |
| C | C | C |
| D | D | D |
| DD | DD | E |
| DDD / F | E | F |
| G | F | G |
| H | FF | H |
| I | G | I |
| J | GG | J |
It's a fitting starting point, not an exact science. Sizing varies a lot between brands and even between styles from the same brand, so use the result as where to start trying sizes rather than a guarantee.
That's what the off-chart note is for. Outside the normal range covered by the chart, the standard cup-letter progression may not apply cleanly, and a specialty bra fitter can help you find an exact match.
Sister sizes have the same cup volume but a different band/cup combination — for example 34C and 36B hold roughly the same amount. They're useful when a band feels wrong but the cup feels right, letting you adjust one dimension without changing the other.
The three systems' cup-letter spacing diverges as cup size increases — for example US DDD/F lines up with UK E and EU F. The chart on this page matches them row by row rather than assuming the letters mean the same thing everywhere.
