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's a simple calculation using a person's height and weight in UK imperial units (stone for weight, feet and inches for height).

2. How Does the Calculator Work?

The calculator uses the BMI formula for UK units:

Where:

• 1 stone = 14 pounds
• 1 foot = 12 inches
• 703 is the conversion factor to adjust for imperial units

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 your weight in stones (e.g., 11.5 for 11 stone 7 pounds) and height in feet and inches. All values must be valid (weight > 0, height > 0).

5. Frequently Asked Questions (FAQ)

Q1: What is a healthy BMI range?
A: For most adults, an ideal BMI is in the 18.5 to 24.9 range. Below 18.5 is underweight, 25-29.9 is overweight, and 30+ is obese.

Q2: Does BMI apply to everyone?
A: BMI may not be accurate for athletes (muscle weighs more than fat), pregnant women, children, and the elderly.

Q3: How often should I check my BMI?
A: For most people, checking every few months is sufficient unless you're actively trying to lose or gain weight.

Q4: What's the difference between stone and kg BMI?
A: The BMI number is the same regardless of units - the formula just converts stone/pounds to the equivalent kg value in the calculation.

Q5: Should I be concerned if my BMI is high?
A: A high BMI can indicate high body fatness, but you should consult with a healthcare provider who can perform additional assessments.