1. What is Body Mass Index (BMI)?

Body Mass Index (BMI) is a measure that uses your height and weight to work out if your weight is healthy. The NHS standard BMI calculation applies to most adults aged 18 and over.

2. How Does the Calculator Work?

The calculator uses the NHS standard BMI formula:

Where:

• \( weight_{kg} \) — Weight in kilograms (kg)
• \( height_{m} \) — Height in meters (m)

Explanation: BMI is calculated by dividing your weight in kilograms by your height in meters squared. It provides a simple numeric measure of a person's thickness or thinness.

3. Importance of BMI Calculation

Details: BMI is widely used as a screening tool to identify possible weight problems in adults. It helps healthcare professionals assess health risks associated with being underweight, overweight, or obese.

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. All values must be valid (weight > 0, height > 0).

5. Frequently Asked Questions (FAQ)

Q1: What are the NHS BMI categories?
A: Underweight (below 18.5), Normal 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 (high muscle mass), pregnant women, children, and the elderly as it doesn't distinguish between muscle and fat.

Q3: How often should I check my BMI?
A: For general health monitoring, checking every 3-6 months is sufficient unless you're actively trying to change your weight.

Q4: What if my BMI is outside the normal range?
A: Consult with a healthcare professional who can provide personalized advice based on your overall health, lifestyle, and medical history.

Q5: Are there other measures besides BMI?
A: Yes, waist circumference, waist-to-hip ratio, and body fat percentage can provide additional information about health risks.