BMI and Body Surface Area Calculator

Calculate body mass index and body surface area from height and weight, with BMI category interpretation and Du Bois BSA for clinical workflows.

BMI and BSA calculator

Use this calculator to convert height and weight into BMI and estimated body surface area. It is useful for documentation, screening conversations, and clinical dosing contexts where BSA is requested.

Height

Weight

Body mass index

26.0 kg/m²

Overweight BMI range

Body surface area

1.86 m²

Du Bois body surface area estimate.

Clinical decision support only. Verify unusual values, follow local guidelines, and interpret calculations alongside the full clinical picture.

Equations used on this page

BMI = weight (kg) / height (m)²

Du Bois BSA (m²) = 0.007184 × height(cm)^0.725 × weight(kg)^0.425

Clinical notes

BMI is a screening measure and does not directly measure adiposity, body composition, or cardiometabolic risk.

BSA formulae are estimates; use the method requested by a specific drug protocol when dosing decisions depend on BSA.

Interpret BMI in context, especially in children, pregnancy, oedema, athletes, older adults, and different ethnic groups.

References

World Health Organization BMI classification overview Du Bois D, Du Bois EF. Arch Intern Med 1916 body surface area formula

These calculators are designed for clinician decision support and SEO-friendly public education. Verify results against the original method and the patient context before making decisions.