1. What is BMI?

Body Mass Index (BMI) is a measure that uses your height and weight to work out if your weight is healthy. The NHS uses BMI as a simple way to assess whether someone might be underweight, a healthy weight, overweight, or obese.

2. How Does the Calculator Work?

The calculator uses the standard BMI formula:

Where:

• \( weight \) — Your weight in kilograms (kg)
• \( height \) — Your height in meters (m)

Explanation: BMI provides a simple numeric measure of a person's thickness or thinness, allowing health professionals to discuss weight problems objectively with their patients.

3. Importance of BMI Calculation

Details: BMI is important because it helps identify potential weight problems in adults. However, it should be considered alongside other measurements as part of a full health assessment.

4. Using the Calculator

Tips: Enter your weight in kilograms and height in meters. For most accurate results, measure your height without shoes and weight in light clothing.

5. Frequently Asked Questions (FAQ)

Q1: What are the NHS BMI categories?
A: Underweight (below 18.5), Healthy weight (18.5-24.9), Overweight (25-29.9), Obese (30 and above).

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 should I do if my BMI is high?
A: Consult your GP who may suggest lifestyle changes like improved diet and increased physical activity.

Q4: Can children use this calculator?
A: No, children need special BMI calculators that account for age and sex as their bodies change rapidly.

Q5: Where can I get more advice?
A: Visit the NHS website (www.nhs.uk) for comprehensive weight management advice and tools.