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. In the UK, weight is commonly measured in stones and pounds, while height is measured in feet and inches.

2. How Does the Calculator Work?

The calculator uses the UK stone BMI formula:

Where:

• 1 stone = 14 pounds
• 1 foot = 12 inches
• 703 is the conversion factor from imperial to metric

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 weight in stones, height in feet and inches, and your age. For children and teens, BMI interpretation is age and sex-specific.

5. Frequently Asked Questions (FAQ)

Q1: What is a healthy BMI range?
A: For adults, 18.5-24.9 is considered healthy. Below 18.5 is underweight, 25-29.9 is overweight, and 30+ is obese.

Q2: Does BMI work for athletes?
A: BMI may overestimate body fat in athletes with muscular builds and underestimate it in older people with less muscle mass.

Q3: How often should I check my BMI?
A: Periodic checks (every 6-12 months) are sufficient unless you're actively trying to change your weight.

Q4: Why include age in the calculator?
A: While age doesn't affect the BMI calculation itself, it helps provide appropriate interpretation since healthy ranges vary by age.

Q5: What's the difference between stone and kg BMI?
A: The BMI number is the same - this calculator just uses UK stone measurements for convenience.