International Bra Size Converter

Band mapping uses UK 28 = EU 60 = AU 6, increasing by UK/AU 2 for each EU 5. Cup labels follow the displayed comparison chart.

Inputs and units

Input system: Choose UK, EU, Australia / NZ.
Band size: Enter your value in the format and unit shown.
Cup index (select the corresponding label): Choose UK AA / EU AA, UK A / EU A, UK B / EU B, UK C / EU C, UK D / EU D, UK DD / EU E, UK E / EU F, UK F / EU G, UK FF / EU H, UK G / EU I, UK GG / EU J, UK H / EU K, UK HH / EU L, UK J / EU M, UK JJ / EU N, UK K / EU O.

Calculation method

Band mapping uses UK 28 = EU 60 = AU 6, increasing by UK/AU 2 for each EU 5. Cup labels follow the displayed comparison chart.

Worked example

The example values are: Input system = uk; Band size = 34; Cup index (select the corresponding label) = 4

UK: 34D
EU: 75D
Australia / NZ: 12D

Assumptions and limitations

Label conversion only, not a fit measurement. Brands and cup progression vary; US sizing is intentionally excluded because its labels are inconsistent.

Using your result

Select Calculate after changing inputs. Copy result copies the displayed output; Download result saves a text file. Reset returns the form to its example inputs. Calculations run in your browser.