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 screens 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 (kg)
• \( height \) — Height in meters (m)

Explanation: BMI 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 is a useful measurement for most people over 20 years old. While it doesn't measure body fat directly, research has shown that BMI correlates to direct measures of body fat.

4. Using the Calculator

Tips: Enter weight in kilograms and height in meters. All values must be valid (weight > 0, height > 0). For women, BMI interpretation is the same as for men though body fat percentages may differ.

5. Frequently Asked Questions (FAQ)

Q1: What is a healthy BMI range?
A: For adults 20 years old and older: Underweight (BMI < 18.5), Normal (18.5-24.9), Overweight (25-29.9), Obesity (BMI ≥ 30).

Q2: Why is BMI important?
A: BMI is a quick screening tool for potential weight problems that could lead to health issues like heart disease, diabetes, and certain cancers.

Q3: Does BMI work for everyone?
A: BMI may overestimate body fat in athletes and others with muscular builds, and may underestimate body fat in older persons who have lost muscle mass.

Q4: How often should I check my BMI?
A: For most adults, checking BMI annually is sufficient unless you're actively trying to lose or gain weight.

Q5: Should pregnant women use BMI?
A: BMI calculations aren't appropriate for pregnant women as weight gain is expected and necessary for healthy pregnancy.