BMI And BSA Calculator

Formulas:

\[ BMI = \frac{Weight}{Height^2} \] \[ BSA = \sqrt{\frac{Weight \times Height}{3600}} \]

Body Mass Index (BMI):

Body Surface Area (BSA):

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1. What are BMI and BSA?

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

2. How Does the Calculator Work?

The calculator uses these formulas:

\[ BMI = \frac{Weight\ (kg)}{Height^2\ (m)} \] \[ BSA = \sqrt{\frac{Weight\ (kg) \times Height\ (cm)}{3600}} \]

Where:

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

3. Importance of BMI and BSA

BMI: Used to classify underweight, normal weight, overweight, and obesity. Helps assess health risks associated with body weight.

BSA: Used in medical practice to calculate drug dosages, chemotherapy regimens, and other medical parameters.

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 healthy BMI range?
A: 18.5-24.9 is considered normal weight. Below 18.5 is underweight, 25-29.9 is overweight, and 30+ is obese.

Q2: Why is BSA important in medicine?
A: Many physiological processes correlate better with BSA than body weight, making it useful for drug dosing.

Q3: What are the limitations of BMI?
A: BMI doesn't distinguish between muscle and fat, so athletes may have high BMI without excess fat.

Q4: Which BSA formula is this calculator using?
A: This uses the Mosteller formula, which is widely accepted and validated.

Q5: Should BMI be interpreted differently for different populations?
A: Yes, some ethnic groups may have different health risks at the same BMI levels.