1. What is BMI?

Body Mass Index (BMI) is a simple calculation using a person's height and weight. The formula is BMI = kg/m² where kg is a person's weight in kilograms and m² is their height in metres squared. It's widely used in the UK as a screening tool to identify possible weight problems.

2. How Does the Calculator Work?

The calculator uses the standard BMI formula:

Where:

• \( weight \) — Body weight in kilograms (kg)
• \( height \) — Height in metres (m)

Explanation: The formula divides your weight by the square of your height to give your BMI in kg/m².

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 kilograms and height in metres. For accurate results, measure your height without shoes and weight with minimal clothing.

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), and Obese (≥30).

Q2: Is BMI accurate for everyone?
A: BMI may not be accurate for athletes (muscle weighs more than fat), pregnant women, or the elderly who may have lost height.

Q3: What's a healthy BMI range?
A: For most adults, 18.5 to 24.9 is considered healthy in the UK.

Q4: Should children use this calculator?
A: No, children need BMI-for-age percentiles as their body composition changes with growth.

Q5: What should I do if my BMI is high?
A: Consult your GP who may assess other factors like waist circumference, diet, and activity levels.