1. What is BMI?

Body Mass Index (BMI) is a simple calculation using a person's height and weight. The formula is BMI = kg/m² where kg is a person's weight in kilograms and m² is their height in meters squared. It provides a reliable indicator of body fatness for most people.

2. How Does the Calculator Work?

The calculator uses the BMI formula:

Where:

• Weight — in kilograms (kg)
• Height — in meters (m)

Explanation: The calculation divides weight by the square of height to correlate with body fat content.

3. Importance of BMI Calculation

Details: BMI is a simple, inexpensive screening method for weight category—underweight, healthy weight, overweight, and obesity. It helps assess risk for diseases that can occur with overweight and obesity.

4. Using the Calculator

Tips: Enter weight in kilograms and height in meters. All values must be valid (weight > 0, height > 0). For pounds and inches, convert first (1 kg = 2.2 lbs, 1 m = 39.37 inches).

5. Frequently Asked Questions (FAQ)

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

Q2: Is BMI accurate for everyone?
A: BMI may overestimate body fat in athletes and underestimate it in older persons with lost muscle mass.

Q3: Why use metric units?
A: The standard BMI formula uses kg and m. For imperial units, multiply weight (lbs) by 703 / height² (in²).

Q4: What's a healthy BMI for men?
A: Generally 18.5 to 24.9, though individual factors like muscle mass should be considered.

Q5: Should BMI be the only measure of health?
A: No, waist circumference, diet, physical activity, and other factors should also be considered.