Bra Size Calculator
Result
Bra Size Calculator Estimate your bra size from your underbust (band) and bust measurements. The band comes from your underbust rounded to the nearest even inch, and the cup from the difference between bust and underbust — about one cup size per inch. — free online calculator.
Formula
- Bra Size Calculator calculates its result from Underbust Rounded To The Nearest Even Inch, One Cup Size. It uses the formula Band = underbust rounded to the nearest even inch; Cup = (bust − underbust) in inches, where each inch ≈ one cup size. Change any input to recalculate the result instantly. This is an informational calculation and is not medical advice.
- The main inputs are Underbust Rounded To The Nearest Even Inch, One Cup Size. Enter them in the units and format shown in the calculator.
- Use the measurement units shown beside each field. The result is an estimate and should be interpreted in context.
- Changing any input above recalculates the result with the same calculation engine used by this page.
Example: Bra Size
- Underbust Rounded To The Nearest Even Inch: 10
- One Cup Size: 3
Using Underbust Rounded To The Nearest Even Inch = 10, One Cup Size = 3, the calculated result is 3.
Sample result: Calculating…
Frequently asked questions
What does the Bra Size calculate?
Bra Size Calculator Estimate your bra size from your underbust (band) and bust measurements. The band comes from your underbust rounded to the nearest even inch, and the cup from the difference between bust and underbust — about one cup size per inch. — free online calculator.
Which values should I enter?
Enter Underbust Rounded To The Nearest Even Inch, One Cup Size using the units and format shown beside each field.
What formula does this calculator use?
The calculator uses the following relationship: Band = underbust rounded to the nearest even inch; Cup = (bust − underbust) in inches, where each inch ≈ one cup size.
Why might my result differ from another source?
Results can differ because measurement methods, rounding and assumptions vary. This calculator is an estimate and is not a medical diagnosis.
Does the result update automatically?
Yes. Changing an input updates the result using the same calculation engine shown on this page.