1. What are BSA and BMI?

Body Surface Area (BSA) is the total surface area of the human body, often used in medical calculations. Body Mass Index (BMI) is a measure of body fat based on height and weight that applies to adult men and women.

2. How Does the Calculator Work?

The calculator uses these formulas:

Where:

• \( Weight \) — Body weight in kilograms (kg)
• \( Height \) — Height in centimeters (cm) for BSA, meters (m) for BMI

Explanation: BSA is calculated using the Mosteller formula, which is simple and widely used. BMI is calculated by dividing weight by the square of height.

3. Importance of BSA and BMI

Details: BSA is important for determining medication dosages and medical indicators. BMI is a screening tool for weight categories that may lead to health problems.

4. Using the Calculator

Tips: Enter weight in kilograms and height in centimeters. All values must be valid (weight > 0, height > 0).

5. Frequently Asked Questions (FAQ)

Q1: What is a normal BSA range?
A: Average BSA is about 1.7 m² for adult men and 1.6 m² for adult women, but varies with body size.

Q2: What are the BMI categories?
A: Underweight (<18.5), Normal (18.5-24.9), Overweight (25-29.9), Obese (≥30).

Q3: Why use BSA for drug dosing?
A: Many drugs' metabolism correlates better with BSA than body weight alone.

Q4: Are there limitations to BMI?
A: BMI doesn't distinguish between muscle and fat, so athletes may have high BMI without excess fat.

Q5: Which BSA formula is most accurate?
A: Mosteller formula is simple and accurate enough for clinical use, though other formulas exist.