1. What is BMI?

Body Mass Index (BMI) is a simple index of weight-for-height that is commonly used to classify underweight, overweight and obesity in adults. It is defined as the weight in kilograms divided by the square of the height in meters (kg/m²).

2. How is BMI Calculated?

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. BMI Categories

Standard 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

Note for Senior Women: For women over 50, a slightly higher BMI (23-27) may be healthier than for younger adults, as some extra weight can protect against osteoporosis.

4. Using the Calculator

Tips: Enter weight in kilograms and height in meters. For height, you can convert from cm to m by dividing by 100 (e.g., 165 cm = 1.65 m).

5. Frequently Asked Questions (FAQ)

Q1: Is BMI accurate for seniors?
A: BMI is less accurate for seniors as it doesn't account for muscle loss or fat distribution changes with age. Waist circumference may be a better indicator.

Q2: Why focus on women over 50?
A: Postmenopausal women have different body composition and health risks. Weight distribution often shifts to the abdomen, increasing health risks.

Q3: What's a healthy BMI for a 50+ woman?
A: While standard categories apply, many experts suggest 23-27 may be ideal for women over 50, balancing various health risks.

Q4: Does BMI account for muscle mass?
A: No, BMI doesn't distinguish between muscle and fat. A muscular person may have a high BMI without excess fat.

Q5: Should I use BMI if I'm very short or tall?
A: BMI may be less accurate for people at height extremes. Consult your doctor for personalized assessment.