1. What is BSA and BMI?

BSA (Body Surface Area): A measurement of the total surface area of the human body, often used in medical calculations.

BMI (Body Mass Index): A value derived from mass and height that categorizes underweight, normal weight, overweight, and obesity.

2. How Does the Calculator Work?

The calculator uses two formulas:

Where:

• \( BSA \) — Body Surface Area (square meters)
• \( BMI \) — Body Mass Index (kg/m²)
• \( W \) — Weight in kilograms
• \( H \) — Height in centimeters for BSA, meters for BMI

3. Importance of BSA and BMI

BSA: Used in medical settings to calculate drug dosages, chemotherapy doses, and to assess metabolic mass.

BMI: Used as a screening tool for weight categories that may lead to health problems.

4. Using the Calculator

Tips: Enter your weight in kilograms and height in centimeters. The calculator will automatically compute both BSA and BMI.

5. Frequently Asked Questions (FAQ)

Q1: What's a normal BSA range?
A: Average BSA is about 1.7 m² for adult men and 1.6 m² for adult women.

Q2: What do BMI numbers mean?
A: Underweight (<18.5), Normal (18.5-24.9), Overweight (25-29.9), Obese (≥30).

Q3: Why are different units used for height?
A: BSA formula traditionally uses cm while BMI uses m. The calculator handles the conversion automatically.

Q4: Is BMI accurate for everyone?
A: BMI may not accurately reflect body fat in athletes (high muscle mass) or elderly (loss of muscle mass).

Q5: What's the Mosteller formula?
A: This is the Mosteller formula for BSA, the most commonly used version in medical practice.