What is this calculator?
Estimate a US band and cup size from two measurements.
What can you use it for?
Use it for practical planning, conversions, measurement or checking the result described here. Estimate a US band and cup size from two measurements.
How to use it
- Enter underbust (in).
- Enter full bust (in).
- Select Calculate (or Generate for random tools).
- Read the answer and any additional results below the form. Check the units and the limits of the method.
Formula and method
Band = underbust rounded to the nearest even inch
Cup index = rounded bust − band
Cup index = rounded bust − band
A small approximate US cup table is used. Brands and countries use different fitting conventions.
Worked example
Underbust (in): 32, Full bust (in): 36. The result is 32D (approximate us bra size).
Assumptions and limits
Approximate US sizing. Fit and cup labels vary between brands and countries.
Frequently asked questions
What inputs does the Bra Size Calculator need?
Use underbust (in), full bust (in). Read the answer and any additional results below the form. Check the units and the limits of the method.
What assumptions apply to the Bra Size Calculator?
Approximate US sizing. Fit and cup labels vary between brands and countries.