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 screening tool to identify potential weight problems in adults and children.

2. How Does the Calculator Work?

The calculator uses the standard BMI formula:

For children and teens, BMI is age- and sex-specific and is often referred to as BMI-for-age. The calculator provides interpretation based on NHS guidelines.

3. Importance of BMI Calculation

Details: BMI is a simple way to screen for weight categories that may lead to health problems. However, it's not a diagnostic tool as it doesn't directly measure body fat.

4. Using the Calculator

Tips: Enter weight in kilograms and height in meters. For children, enter age and gender for more accurate interpretation. Measurements should be as accurate as possible.

5. Frequently Asked Questions (FAQ)

Q1: What is a healthy BMI range?
A: For adults, 18.5-24.9 is considered healthy. For children, BMI is compared to growth charts specific to age and sex.

Q2: Are there limitations to BMI?
A: Yes. BMI doesn't distinguish between muscle and fat, so athletes may have high BMI without excess fat. It also doesn't account for fat distribution.

Q3: How often should I check my BMI?
A: For most adults, checking every few months is sufficient unless you're actively trying to lose or gain weight.

Q4: What's different about child BMI calculations?
A: Children's BMI is compared to growth charts to determine a percentile ranking rather than using fixed categories.

Q5: Should I use BMI if I'm pregnant?
A: No, BMI calculations are not appropriate during pregnancy. Consult your healthcare provider for weight guidance.