Body Surface Area Calculator
Compute BSA using four validated medical formulas: Du Bois, Mosteller, Haycock, and Boyd.
Body Surface Area Results
What is Body Surface Area (BSA)?
Body Surface Area is a measurement of the total surface area of the human body. It is used in medicine to calculate drug dosages, assess metabolic rate, and evaluate cardiac index. BSA correlates better with many physiological processes than body weight alone.
How to Use This Calculator
- Select your unit system (metric or imperial).
- Enter your weight and height.
- Click Calculate to see BSA estimates from four commonly used formulas.
Frequently Asked Questions
Which BSA formula is most accurate?
Mosteller is widely used for its simplicity and reliability. Du Bois is the classic standard. Haycock and Boyd are often preferred for pediatric or specific populations. All provide clinically useful estimates.
Why is BSA used instead of weight for dosing?
BSA correlates with blood volume, cardiac output, and renal function more closely than weight. This makes it especially useful for chemotherapy and other potent medications.
What is a normal BSA for adults?
The average BSA for adult men is about 1.9 m² and for adult women about 1.6 m². Actual values vary with height and weight.
Can I use this for children?
Yes, these formulas work for children as well, but pediatric dosing often uses weight-based or age-based adjustments in addition to BSA. Always consult a pediatrician.