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:

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

Explanation: BMI is calculated by dividing weight in kilograms by the square of height in meters. The result is then categorized into standard weight status categories.

3. Importance of BMI Calculation

Details: BMI is a simple, inexpensive screening method for weight category—underweight, healthy weight, overweight, and obesity. It can indicate potential health risks associated with being underweight or overweight.

4. Using the Calculator

Tips: Enter weight in kilograms, height in meters, select gender and enter age. All values must be valid (weight > 0, height > 0, age between 2-120).

5. Frequently Asked Questions (FAQ)

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

Q2: Is BMI different for men and women?
A: The same BMI formula applies to both genders, but interpretation may vary slightly due to differences in body composition.

Q3: What are the limitations of BMI?
A: BMI doesn't directly measure body fat and doesn't account for muscle mass, bone density, overall body composition, or racial and sex differences.

Q4: How does BMI change with age?
A: For children and teens, BMI is age- and sex-specific and is referred to as BMI-for-age. For adults, BMI is interpreted through standard weight status categories.

Q5: Should athletes use BMI?
A: Athletes with high muscle mass may have a high BMI but low body fat. Additional measurements may be needed for accurate assessment.