1. What are BMI and BSA Calculators?

Definition: These calculators determine Body Mass Index (BMI) and Body Surface Area (BSA), important health metrics.

Purpose: BMI assesses weight status, while BSA is used for medical dosages and assessments.

2. How Do the Calculators Work?

The calculators use the formulas:

Where:

• BMI — Body Mass Index (kg/m²)
• BSA — Body Surface Area (m²)
• Weight — in kilograms
• Height — in centimeters for BSA, converted to meters for BMI

3. Importance of BMI and BSA

BMI: Classifies underweight, normal weight, overweight, and obesity. Not a direct measure of body fat but correlates with health risks.

BSA: Used for chemotherapy dosing, renal function assessment, and other medical calculations where body size matters.

4. Using the Calculator

Tips: Enter weight in kilograms and height in centimeters. Both values must be > 0.

5. Frequently Asked Questions (FAQ)

Q1: What's a normal BMI range?
A: 18.5-24.9 kg/m² is normal, below 18.5 is underweight, 25-29.9 is overweight, 30+ is obese.

Q2: Why different height units for BMI and BSA?
A: BMI traditionally uses meters while BSA formulas typically use centimeters for height.

Q3: What's the average BSA for adults?
A: About 1.7 m² for men and 1.6 m² for women, but varies significantly by size.

Q4: Are there limitations to BMI?
A: Yes, it doesn't account for muscle mass, bone density, or fat distribution.

Q5: Which BSA formula is this?
A: This uses the Mosteller formula, the most commonly used in medical practice.