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 Direct BMI calculator applies the standard formula to assess weight status according to UK health guidelines.

2. How Does the Calculator Work?

The calculator uses the standard BMI formula:

Where:

• \( weight \) — Body weight in kilograms
• \( height \) — Height in meters

Classification:

• Underweight: BMI below 18.5
• Healthy weight: BMI 18.5 to 24.9
• Overweight: BMI 25 to 29.9
• Obese: BMI 30 or above

3. Importance of BMI Calculation

Details: BMI is a simple screening tool that helps identify potential weight problems in adults. While not a direct measure of body fat, it correlates with more direct measures of body fat and provides a reliable indicator for most people.

4. Using the Calculator

Tips: For accurate results, measure weight in kilograms and height in meters. Measure height without shoes and weight in light clothing. The calculator is for adults only - different charts are used for children.

5. Frequently Asked Questions (FAQ)

Q1: Is BMI accurate for everyone?
A: BMI may not be accurate for athletes (who may have high muscle mass), pregnant women, or those with certain medical conditions. It's a screening tool, not a diagnostic measure.

Q2: What's a healthy BMI range?
A: For most adults, 18.5 to 24.9 is considered healthy. However, optimal BMI may vary by ethnicity and other factors.

Q3: Should I use different measurements?
A: Waist circumference may provide additional information about health risks associated with abdominal fat.

Q4: How often should I check my BMI?
A: Periodic checks (every 6-12 months) can help track changes, but dramatic changes should be discussed with a healthcare professional.

Q5: Where can I get help with my weight?
A: The NHS offers free weight management services. Speak to your GP or visit the NHS website for more information.