Bra Size Equivalent Chart

An equivalent is the label another system prints on the same body, so the conversion has to start from the body. The band is a snug underbust measurement, and each system just names it differently: the US and UK use the inches (34), continental Europe uses centimeters rounded to a five (75), France and Spain add fifteen to the European number (90), Australia subtracts 22 from the US number (12), and Italy counts bands from 1 (3). Those are formulas, and this site applies them exactly: EU is 2.5 times the US band minus 10, FR is EU plus 15, AU is US minus 22, IT is half the US band minus 14, so Italian sizing starts at a 30 band.

The cup is where equivalents go wrong. Every system counts one inch of bust-over-band per letter from A, so the sixth cup is a six-inch difference everywhere; but the US writes it DDD, the UK writes it E, and continental Europe writes it F. Converting by matching letters puts a US DDD wearer into a UK DDD that does not exist or an EU E that is a cup too small. Converting by position, sixth cup to sixth cup, gets it right every time, and that is how every row in the chart below is built. The cup size chart shows the three alphabets side by side; the converter does any pair.

Eighty sizes, 28 to 46 bands and A to H cups, each with the five other labels and the two sisters. Filter by band to shorten the table; tap a US size for its guide page, which adds the brand run and the fit checks for that size. Cups above H (US I, J, K; UK FF to K) follow the same rules and are listed on the biggest bra size page.

Japanese sizes use the EU cup letters on the EU band with a leading letter (a US 34D is a JP D75). Australian and New Zealand letters follow the UK alphabet; Italian letters follow the European one.