Why are UK and US cup sizes different?

Above a D cup the two systems diverge — for example a UK DD is a US DD, but a UK E is a US DDD and a UK F is a US DDD's next step up. This tool keeps the cup letters aligned to the same physical volume automatically.

How do EU bra band sizes relate to inches?

EU bands are measured in centimetres, so a 32-inch band is roughly EU 70, 34 inches is EU 75, and so on in steps of five centimetres.

Is my size sent anywhere?

No. The conversion tables are built into the page and run only in your browser.

Bra Size Converter — Gera Tools

Bra size converter

Bra sizing changes a lot between countries — and UK and US cup letters diverge above a D cup, which trips up most charts. This converter aligns the cups by physical volume so the equivalents are correct, then shows your band and cup in UK, US, EU/DE, FR/ES and AU/NZ.

Choose whether your starting size uses UK or US cups, pick your band and cup, and the full table appears. Brands still vary, so treat the result as a confident starting point. Nothing you enter leaves your browser.