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 BMI calculation applies to most adults aged 18 and over.

2. How Does the Calculator Work?

The calculator uses the standard BMI formula:

Where:

• \( weight \) — Body weight in kilograms (kg)
• \( height \) — 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 more objectively with their patients.

3. Importance of BMI Calculation

Details: BMI is widely used as a screening tool to identify possible weight problems in adults. It can indicate whether you're underweight, healthy weight, overweight, or obese, which can help determine your risk for certain health conditions.

4. Using the Calculator

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

5. Frequently Asked Questions (FAQ)

Q1: What are the NHS BMI categories?
A: Under 18.5 = underweight, 18.5-24.9 = healthy weight, 25-29.9 = overweight, 30 and above = obese.

Q2: Is BMI accurate for everyone?
A: BMI may not be accurate for athletes (muscle weighs more than fat), pregnant women, children, and elderly people with reduced muscle mass.

Q3: Should I be concerned if my BMI is outside the healthy range?
A: If your BMI is outside the healthy range, consult your GP who can provide personalized advice considering your individual circumstances.

Q4: How often should I check my BMI?
A: For most adults, checking every 3-6 months is sufficient unless you're actively trying to lose or gain weight.

Q5: What's a healthy BMI for older adults?
A: For adults aged 65 and over, a BMI between 23-29.9 may be healthier than the standard range, as being slightly overweight can be protective.