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 for feet and stone units:

Where:

• \( weight \) — Weight in stones
• \( feet \) — Height in feet component
• \( inches \) — Height in inches component
• 14 — Conversion factor from stone to pounds
• 703 — Conversion factor from inches to meters squared

Explanation: The formula converts stone to pounds and combines feet and inches into total inches before calculating BMI.

3. Importance of BMI Calculation

Details: BMI is a simple screening tool for weight categories that may lead to health problems. It helps identify potential weight problems in adults.

4. Using the Calculator

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

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 overestimate body fat in athletes and underestimate it in older people with lost muscle mass.

Q3: Why use feet and stone instead of metric?
A: This calculator is designed for those more comfortable with imperial units commonly used in some countries.

Q4: How often should I check my BMI?
A: Periodic checks (every few months) can help track weight changes, but daily fluctuations are normal.

Q5: What should I do if my BMI is high?
A: Consult a healthcare provider for personalized advice on diet and exercise.