1. What is BMI?

BMI (Body Mass Index) is a simple index of weight-for-height that is commonly used to classify underweight, normal weight, overweight and obesity in adults. It is calculated by dividing a person's weight in kilograms by the square of their height in meters.

2. How Does the Calculator Work?

The calculator uses the BMI formula:

Where:

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

Explanation: The formula provides a simple numeric measure of a person's thickness or thinness, allowing health professionals to discuss weight problems more objectively with their patients.

3. Importance of BMI Calculation

Details: BMI provides the most useful population-level measure of overweight and obesity as it is the same for both sexes and for all ages of adults. However, it should be considered a rough guide because it may not correspond to the same degree of fatness in different individuals.

4. Using the Calculator

Tips: Enter weight in kilograms and height in meters. All values must be valid (weight > 0, height > 0). The calculator will show your BMI and weight category, and if you're overweight or obese, it will calculate how much weight you need to lose to reach a normal BMI.

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), Obese (≥30).

Q2: Is BMI accurate for everyone?
A: BMI may not be accurate for athletes (who may have high muscle mass), pregnant women, or the elderly (who may have lost muscle mass).

Q3: What is a healthy BMI range?
A: For most adults, a healthy BMI is between 18.5 and 24.9.

Q4: How much weight should I lose to reach normal BMI?
A: The calculator shows how many kilograms you need to lose to reach a BMI of 24.9 (upper limit of normal range).

Q5: Should BMI be the only measure of healthy weight?
A: No, waist circumference and other factors should also be considered as BMI doesn't account for muscle mass or fat distribution.