Body Surface Area Calculator
Estimate your body surface area using the Mosteller formula.
An informational estimate, not medical advice — clinical uses of BSA (like medication dosing) require a healthcare provider's calculation, not a general-purpose tool.
Body surface area
1.82 m²
Mosteller formula
For informational and educational purposes only — not medical advice, and not a substitute for consulting a qualified professional about your specific situation. TrueMeasureKit is not liable for decisions made based on these results. See our Terms of Service.
Why BSA instead of just weight
Body surface area estimates the total external area of the body, which scales differently than weight alone — a tall, lean person and a short, heavier person can weigh the same but have meaningfully different surface areas. That's why BSA (rather than weight) is the standard basis for scaling certain medication doses and some physiological measurements in clinical settings. The Mosteller formula used here — BSA = √(height(cm) × weight(kg) / 3600) — is the most widely used version for its balance of simplicity and accuracy.
Frequently asked questions
What's the Mosteller formula?
A widely used clinical formula — BSA = √(height in cm × weight in kg ÷ 3600) — valued for its simplicity and accuracy, commonly used to calculate medication dosing and certain physiological measurements in clinical practice.
Why does body surface area matter medically?
Some medications (particularly chemotherapy drugs) are dosed based on BSA rather than weight alone, since it correlates better with blood volume and metabolic rate — though actual clinical dosing should always come from a healthcare provider, not a self-calculated estimate.