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. BMI provides a reliable indicator of body fatness for most people.

2. How Does the Calculator Work?

The calculator uses the standard BMI formula:

Where:

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

Weight Loss Percentage: If initial weight is provided, the calculator also computes percentage weight loss using: \[ \text{Weight Loss \%} = \frac{\text{Initial Weight} - \text{Current Weight}}{\text{Initial Weight}} \times 100 \]

3. Importance of BMI Calculation

Details: BMI is a simple, inexpensive screening method for weight category—underweight, healthy weight, overweight, and obesity. It's used to screen for potential health problems related to weight.

4. Using the Calculator

Tips: Enter weight in kilograms and height in meters. For weight loss percentage, include your initial weight. All values must be positive numbers.

5. Frequently Asked Questions (FAQ)

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

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

Q3: What is a healthy weight loss percentage?
A: Losing 5-10% of your body weight can produce health benefits if overweight.

Q4: How often should I check my BMI?
A: Periodic checks (every few months) can help track progress, but daily fluctuations are normal.

Q5: Should BMI be the only measure of health?
A: No, waist circumference and other factors should also be considered for a complete health assessment.