1. What is BMI?

Body Mass Index (BMI) is a measure that uses your height and weight to determine if your weight is healthy. The NHS uses BMI as a screening tool to identify potential weight problems in adults, including women over 50.

2. How BMI is Calculated

The calculator uses the standard BMI formula:

Where:

• \( weight \) — Your weight in kilograms
• \( height \) — Your height in meters

Note: For women over 50, the same BMI ranges apply but should be interpreted with consideration of age-related body composition changes.

3. BMI Categories for Women Over 50

Categories:

• Underweight: BMI less than 18.5
• Normal weight: BMI 18.5 to 24.9
• Overweight: BMI 25 to 29.9
• Obese: BMI 30 or greater

Considerations: Postmenopausal women may have higher body fat percentages at the same BMI compared to younger women.

4. Using the Calculator

Instructions: Enter your weight in kilograms and height in meters. For accuracy, measure your height without shoes and weight in light clothing.

5. Frequently Asked Questions (FAQ)

Q1: Is BMI accurate for women over 50?
A: BMI remains a useful screening tool but may overestimate body fat in muscular women or underestimate it in those with reduced muscle mass.

Q2: Should older women have different BMI targets?
A: Some research suggests slightly higher BMI ranges (up to 27) may be healthier for women over 65, but consult your GP.

Q3: How often should I check my BMI?
A: For most women, checking every 6-12 months is sufficient unless actively trying to lose or gain weight.

Q4: What if my BMI shows I'm overweight?
A: Discuss with your GP who may assess waist measurement, diet, activity levels, and other health markers.

Q5: Where can I get more NHS weight management advice?
A: Visit the NHS website or speak to your GP about local weight management services.