Find your bra size using underbust and bust measurements (US sizing)
| Band Size | Underbust (in) | Cup Size | Difference (in) |
|---|---|---|---|
| 28 | 26–27 | AA | < 1 |
| 30 | 28–29 | A | 1 |
| 32 | 30–31 | B | 2 |
| 34 | 32–33 | C | 3 |
| 36 | 34–35 | D | 4 |
| 38 | 36–37 | DD (E) | 5 |
| 40 | 38–39 | DDD (F) | 6 |
| 42 | 40–41 | G | 7 |
| 44 | 42–43 | H | 8 |
This bra size calculator uses your underbust and bust measurements to determine your band size, cup size, and recommended bra size following US sizing conventions. Accurate measurements are key to finding a comfortable and supportive fit.
Measure underbust snugly around the ribcage directly under the bust. Measure bust around the fullest part of the chest, keeping the tape parallel to the ground. Wear a non-padded bra for the most accurate bust measurement. Take measurements while standing and breathing normally.
Bra fit varies by brand, fabric, and body shape. The calculator provides a starting point, but sister sizing (adjusting band and cup proportionally) may improve fit. For example, a 34C is sister-sized to 32D or 36B. Always try bras on and assess comfort.