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:

• 1 stone = 14 pounds
• 1 foot = 12 inches
• 703 — Conversion factor to convert from lbs/in² to kg/m²

3. Importance of BMI Calculation

Details: BMI is a simple screening tool to identify possible weight problems in adults. While it doesn't measure body fat directly, research has shown that BMI correlates with more direct measures of body fat.

4. Using the Calculator

Tips: Enter your weight in stones, and height in feet and inches. 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: What are the limitations of BMI?
A: Doesn't account for muscle mass, bone density, overall body composition, or racial/sex differences.

Q4: Should children use this calculator?
A: No, children and teens need age- and sex-specific BMI calculations.

Q5: What's a healthy BMI range?
A: For most adults, 18.5 to 24.9 is considered healthy, but consult your doctor for personalized advice.