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Convert bra sizes between US, UK, EU, AU, and FR/IT systems. Enter band and cup size to see all equivalents.
Bra size is a standardized measurement combining a band size (the circumference around the ribcage) and a cup size (the difference between bust and band measurements). Sizing systems vary by country — a US 34C is equivalent to a UK 34C, EU 75C, and AU 12C.
| US/UK | EU | FR/BE | AU/NZ |
|---|---|---|---|
| 28 | 60 | 75 | 6 |
| 30 | 65 | 80 | 8 |
| 32 | 70 | 85 | 10 |
| 34 | 75 | 90 | 12 |
| 36 | 80 | 95 | 14 |
| 38 | 85 | 100 | 16 |
| 40 | 90 | 105 | 18 |
| 42 | 95 | 110 | 20 |
| 44 | 100 | 115 | 22 |
| 46 | 105 | 120 | 24 |
| Cup | Bust − Band Difference |
|---|---|
| AA | < 1 inch |
| A | 1 inch |
| B | 2 inches |
| C | 3 inches |
| D | 4 inches |
| DD/E | 5 inches |
| DDD/F | 6 inches |
| G | 7 inches |
| H | 8 inches |
Formula
Cup Size = Bust Measurement − Band MeasurementBust Measurement = circumference around the fullest part of the bust, in inches
Band Measurement = circumference around the ribcage just below the bust, in inches
Cup Size = letter (A–H+) determined by the inch difference between bust and band
Worked Example
36" bust, 32" band — what bra size?
Did you know? Studies have found that approximately 80% of women wear the wrong bra size, often wearing bands that are too large and cups that are too small (source: British Journal of Plastic Surgery, 2003).
Sources
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