1. What is BMI?

BMI (Body Mass Index) is a measure that uses your height and weight to work out if your weight is healthy. The NHS uses BMI as a screening tool to identify potential weight problems in adults.

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 compares your weight to your height to estimate body fatness.

3. Importance of BMI Calculation

Details: BMI helps identify weight categories that may lead to health problems. It's used to screen for weight categories that might indicate underweight, healthy weight, overweight, or obesity.

4. Using the Calculator

Tips: Enter your weight in kilograms and height in meters. For accurate results, measure your height without shoes and weight with minimal 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 has limitations - it may overestimate body fat in muscular people and underestimate it in older people who have lost muscle.

Q3: Should children use this calculator?
A: No, children and teens need age- and sex-specific BMI calculations as their bodies change with growth.

Q4: What if I know my weight in stones/pounds?
A: Convert to kilograms first (1 stone = 6.35kg, 1 pound = 0.45kg).

Q5: What should I do if my BMI is outside the healthy range?
A: Consult your GP for advice. They may suggest dietary changes, exercise, or other interventions.