Calculators
Bra Size Calculator
Estimate bra band and cup size.
FreeNo sign-upWorks in your browser
Enter details
Result
Estimated bra size
32D
Approximate — brands vary
About the Bra Size Calculator
Enter your underbust (band) and bust measurements in inches and the calculator estimates your bra size — the band from the underbust and the cup from the difference between bust and band. Fit varies by brand, so treat it as a starting size to try on.
How to use the Bra Size Calculator
- 1Enter your underbust (band) and bust measurements.
- 2Read the result instantly — it recalculates as you type.
- 3Adjust the numbers to model different scenarios.
Frequently asked questions
How is bra size calculated?
The band comes from your underbust measurement; the cup from the difference between your bust and band (each inch is roughly one cup up).
Why does my size differ by brand?
Sizing and cut vary between makers and countries. Use this as a starting point and try styles on for the best fit.