BSA Calculator

What is BSA?

BSA (Body Surface Area) BSA (Body Surface Area) is the total surface area of the human body. It is an important physiological indicator in medicine, used for drug dosage calculations, burn assessment, dialysis dosage determination, etc.

Applications of BSA

Drug Dosage: Chemotherapy drugs are dosed based on BSA to ensure safety and efficacy
Burn Assessment: Evaluates the percentage of body surface area affected by burns
Kidney Dialysis: Calculates dialysis dose and urea clearance index
Cardiovascular Index: Calculates cardiac index (CI = CO / BSA)
Fluid Requirements: Calculates fluid replacement for burn or surgery patients

Common BSA Calculation Formulas

Mosteller Formula (Most Common)

BSA = √(heightcm × weightkg / 3600)

Simple calculation, widely used in clinical practice

Du Bois Formula (Gold Standard)

BSA = 0.007184 × weight^0.425 × height^0.725

Introduced in 1916, the earliest BSA calculation formula

Haycock Formula

BSA = 0.024265 × weight^0.5378 × height^0.3964

Suitable for children and adolescents

Boyd Formula

BSA = 0.0003207 × weight^(0.7285 - 0.0188×log10weight) × height^0.3

Considers the effect of weight on the exponent, more complex

How to Measure Height and Weight?

Height: Remove shoes, stand straight against a wall, measure vertical distance from head to ground with a ruler
Weight: Measure in the morning after fasting and bowel movement, wearing light clothing
Consistency: Always measure under the same conditions for easier tracking of changes

Frequently Asked Questions (FAQ)

1. What is BSA?

BSA is an important health metric used to assess your physical fitness and overall health status.

2. How accurate is the calculation?

The calculation is based on well-established scientific formulas and provides a reliable estimate for most people.

3. How often should I check?

We recommend checking every 4-8 weeks to track your progress and adjust your training or health plan accordingly.

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