1. What is BMI?

Body Mass Index (BMI) is a measure of body fat based on height and weight that applies to adult men and women. It provides a simple numeric measure of a person's thickness or thinness.

2. How Does the Calculator Work?

The calculator uses the BMI formula:

Where:

• \( weight \) — Weight in kilograms (kg)
• \( height \) — Height in feet (ft)
• \( 3.2808 \) — Conversion factor from feet to meters

Explanation: The formula converts height from feet to meters (by dividing by 3.2808) and then calculates the standard BMI (weight in kg divided by height in meters squared).

3. Importance of BMI Calculation

Details: BMI is a simple screening tool to identify possible weight problems in adults. It can indicate whether a person is underweight, normal weight, overweight, or obese.

4. Using the Calculator

Tips: Enter weight in kilograms and height in feet. All values must be valid (weight > 0, height > 0).

5. Frequently Asked Questions (FAQ)

Q1: What are the standard BMI categories?
A: Underweight (<18.5), Normal weight (18.5-24.9), Overweight (25-29.9), Obese (≥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: Why use kg and feet in this calculator?
A: This calculator is designed for users who prefer metric weight units but imperial height units.

Q4: How often should I check my BMI?
A: For most adults, checking BMI every few months is sufficient unless you're actively trying to change your weight.

Q5: Should children use this calculator?
A: No, children and teens need age- and sex-specific BMI percentiles rather than the adult categories.