1. What is BMI?

Body Mass Index (BMI) is a person's weight in kilograms divided by the square of height in meters. It's a simple screening tool for weight categories that may lead to health problems.

2. How Does the Calculator Work?

The calculator uses the standard BMI formula:

Where:

• \( weight \) — Body weight in kilograms
• \( height \) — Height in meters

Explanation: The formula calculates body mass relative to height, providing a standardized measure of body composition.

3. Importance of BMI Calculation

Details: BMI is used to screen for weight categories that may lead to health problems. For men, BMI interpretation may vary slightly by age.

4. Using the Calculator

Tips: Enter weight in kg, height in meters, and age in years. All values must be valid (weight > 0, height > 0, age ≥18).

5. Frequently Asked Questions (FAQ)

Q1: What are the NIH BMI categories for men?
A: Underweight (<18.5), Normal (18.5-24.9), Overweight (25-29.9), Obese (≥30).

Q2: Does BMI interpretation change with age?
A: For older men, a BMI of 23-29 may be healthier than lower values due to age-related muscle loss.

Q3: What are BMI limitations?
A: BMI doesn't distinguish between muscle and fat. Athletes may have high BMI without excess fat.

Q4: Should BMI be used alone for health assessment?
A: No, waist circumference and other factors should also be considered.

Q5: How often should BMI be checked?
A: Adults should monitor BMI annually or when significant weight changes occur.