How to Read This Bra Size Chart
Each row shows one physical fit across every labeling system. Find your size in your home region's column, then read across the row for the equivalent elsewhere. For example, a US 34B is a 34B in the UK, 75B in the EU, 90B in France, B75 in Japan, and 12B in Australia — same band and cup volume, six different labels.
Why the Band Numbers Don't Match
US and UK band sizes are nearly identical — both traditionally add a few inches to your underbust measurement, so the numbers line up. EU, France, and Spain instead measure your underbust directly in centimeters (with France and Spain adding roughly 15cm on top of the EU figure), which is why a US 34 becomes an EU 75 and a French 90 for the same body. Japan follows its own centimeter-based band scale, and Australia's band numbers track closer to the UK system while its cup lettering can shift by a step or two compared to US cups.
Cup Letters Aren't Universal Either
A cup letter only means something relative to its own band system — a "B" cup on a 34 band is not the same volume as a "B" cup on a 38 band, and cup letters don't always shift the same way between countries as band numbers do. That's why this chart matches complete band+cup combinations row by row instead of translating bands and cups separately — it avoids the rounding errors that come from converting each part in isolation.