Question 1

How do you calculate body surface area?

Accepted Answer

The simplest method uses the Mosteller formula: BSA (m²) = √(Height(cm) × Weight(kg) ÷ 3600). Example: 165 cm, 60 kg: BSA = √(165 × 60 ÷ 3600) = √2.75 = 1.66 m². Our calculator provides results from multiple validated formulas simultaneously.

Question 2

What is the average body surface area?

Accepted Answer

Average adult male: ~1.90 m². Average adult female: ~1.60 m². The 'standard' reference person used in many pharmacokinetic studies has a BSA of 1.73 m² (based on a 70 kg, 170 cm individual).

Question 3

Why is BSA used for chemotherapy dosing?

Accepted Answer

Many chemotherapy drugs are dosed in mg/m² because drug clearance by organs (liver and kidneys) correlates reasonably well with BSA. This approach theoretically produces more consistent drug exposure across different body sizes than simple mg/kg dosing. However, BSA-based dosing still leaves significant variation in drug blood levels between patients.

Question 4

Does BSA affect athletic performance?

Accepted Answer

Indirectly, through thermoregulation. Higher BSA-to-mass ratio (typically smaller, leaner athletes) allows more efficient heat dissipation during exercise. This is one reason smaller athletes often perform better in hot conditions. Elite marathon runners have among the highest BSA-to-mass ratios of any athletic population.

Question 5

How often should I recalculate?

Accepted Answer

Recalculate when your weight changes by 5+ kg, when your activity level changes significantly, or every 3–6 months to account for age-related metabolic changes. For athletes, recalculate training-related values (VDOT, training zones, VO2max estimates) after each significant race or every 6–8 weeks of structured training.

Question 6

Are these calculations accurate for everyone?

Accepted Answer

All calculations use validated scientific formulas but are estimates based on population averages. Individual variation means any estimate could be off by 10–20% for a specific person. Use the results as starting points and adjust based on real-world outcomes over several weeks of monitoring.

Question 7

How do I track progress with this calculator?

Accepted Answer

Take measurements under consistent conditions (same time of day, same hydration state, same scales/devices) and record results with the date. Re-measure every 4–8 weeks during active training or diet phases. Look for consistent directional trends over 4+ weeks rather than reacting to individual fluctuations, which are largely caused by measurement variation and normal biological variation.

Question 8

What other metrics should I track alongside this?

Accepted Answer

For comprehensive health monitoring, no single metric tells the whole story. Combine body composition metrics (weight, body fat %, waist circumference) with performance metrics (running pace at a standard heart rate, 5K time, 1RM strength) and wellbeing metrics (sleep quality, resting heart rate, HRV). The most meaningful progress often shows in performance and wellbeing metrics before it shows on the scale.

Công Thức	Phương Trình	Được Đề Xuất Cho
Mosteller (1987)	BSA = √(cm × kg / 3.600)	Ứng dụng lâm sàng chung; phổ biến nhất
DuBois (1916)	BSA = 0,007184 × cm⁰·⁷²⁵ × kg⁰·⁴²⁵	Người lớn; lịch sử rộng rãi nhất
Haycock (1978)	BSA = 0,024265 × cm⁰·³⁹⁶⁴ × kg⁰·⁵³⁷⁸	Trẻ em và người lớn; khuyến nghị nhi khoa

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