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. For men, BMI ranges are sometimes adjusted for age.

2. How Does the Calculator Work?

The calculator uses the standard BMI formula:

Where:

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

Age Adjustment: For men over 65, slightly higher BMI ranges are used to account for normal age-related changes in body composition.

3. Importance of BMI Calculation

Details: 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.

4. Using the Calculator

Tips: Enter weight in kilograms, height in meters, and age in years. All values must be valid (weight > 0, height > 0, age between 18-120).

5. Frequently Asked Questions (FAQ)

Q1: Why is age considered in BMI for men?
A: Older men naturally have higher body fat percentages at the same BMI as younger men, so slightly higher ranges are often used.

Q2: What are normal BMI values for men?
A: For men under 65: 18.5-24.9 (normal), 25-29.9 (overweight), 30+ (obese). For 65+: 22-26.9 (normal), 27-31.9 (overweight), 32+ (obese).

Q3: When should BMI not be used?
A: BMI may overestimate body fat in athletes and muscular individuals, and underestimate it in older people who have lost muscle mass.

Q4: How often should BMI be checked?
A: For most adults, checking BMI annually is sufficient unless actively trying to gain or lose weight.

Q5: Does BMI measure health?
A: BMI is a screening tool but doesn't directly measure body fat or health. Other factors like waist circumference and body composition should also be considered.