Body Surface Area Calculator
Calculate body surface area with five clinical formulas - used for chemotherapy dosing, cardiac indices and metabolic calculations.
Mosteller (most common)
1.845 m²
Du Bois
1.848 m²
Haycock
1.847 m²
Gehan & George
1.854 m²
Boyd
1.851 m²
Average adult BSA is about 1.9 m\u00B2 for men and 1.6 m\u00B2 for women. Clinical dosing protocols specify which formula to use.
How to Use the Body Surface Area Calculator
- Enter height and weight in metric or imperial units.
- Review the five formula outputs side by side; Mosteller is the most common default.
- Use the result for clinical dosing or physiological index calculations as directed by a professional.
Formulas Used
Mosteller: BSA = √(height(cm) × weight(kg) / 3600)
Du Bois: BSA = 0.007184 × height^0.725 × weight^0.425
Haycock: BSA = 0.024265 × height^0.3964 × weight^0.5378
Frequently Asked Questions
What is a normal BSA value?
Average adult values are about 1.9 m² for men and 1.6 m² for women, but healthy ranges vary widely with height and weight.
Why is BSA used for drug dosing?
Many drugs - especially chemotherapy agents and some anaesthetics - scale better with surface area than raw weight because it reflects metabolic mass more closely.
Which BSA formula should I use?
Mosteller is the most widely used clinically because it is easy to compute mentally. Oncology protocols usually specify which formula to apply - differences between them are small.
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