Compare calculators
Both calculators run independently — change the inputs on either side to compare results.
Health
Bra Size Calculator
Estimate a US bra size from underbust and bust measurements. Returns band size and cup letter in the form '34B'.
Fill in the required fields to see your result.
Fitness
BMI Calculator
Calculate Body Mass Index (BMI) — body weight in kg divided by height in metres squared — to screen for under/overweight categories. The most widely used population-level fitness and health risk metric, with known limitations for athletes and unusual body compositions.
Fill in the required fields to see your result.
Key differences
| Bra Size Calculator | BMI Calculator | |
|---|---|---|
| Category | Health | Fitness |
| Inputs required | 2 | 2 |
| Result | US Bra Size | Your BMI |
| What it does | Estimate a US bra size from underbust and bust measurements. Returns band size and cup letter in the form '34B'. | Calculate Body Mass Index (BMI) — body weight in kg divided by height in metres squared — to screen for under/overweight categories. The most widely used population-level fitness and health risk metric, with known limitations for athletes and unusual body compositions. |