Compare calculators
Both calculators run independently — change the inputs on either side to compare results.
Medicine
Body Surface Area Calculator
Calculate body surface area (BSA) in m² using the Mosteller, Du Bois or Haycock formula from your weight and height. Clinicians use BSA to dose chemotherapy, normalise cardiac index and estimate burn coverage.
Fill in the required fields to see your result.
Medicine
BMI Calculator
Instantly compute your Body Mass Index from weight and height to screen which WHO weight category you fall in. Returns a single kg/m² number classified as underweight, normal, overweight, or obese.
Fill in the required fields to see your result.
Key differences
| Body Surface Area Calculator | BMI Calculator | |
|---|---|---|
| Category | Medicine | Medicine |
| Inputs required | 3 | 2 |
| Result | Body Surface Area (m²) | Your BMI |
| What it does | Calculate body surface area (BSA) in m² using the Mosteller, Du Bois or Haycock formula from your weight and height. Clinicians use BSA to dose chemotherapy, normalise cardiac index and estimate burn coverage. | Instantly compute your Body Mass Index from weight and height to screen which WHO weight category you fall in. Returns a single kg/m² number classified as underweight, normal, overweight, or obese. |