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BMI Formula:
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Body Mass Index (BMI) is a simple index of weight-for-height that is commonly used to classify underweight, normal weight, overweight and obesity in adults. It is defined as a person's weight in kilograms divided by the square of their height in meters (kg/m²).
The calculator uses the standard BMI formula:
Where:
Interpretation: The result is classified according to WHO categories:
Details: 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. It is used to screen for weight categories that may lead to health problems.
Tips: Enter weight in kilograms and height in meters. For accurate results, measure weight in light clothing and height without shoes. All values must be valid (weight > 0, height > 0).
Q1: Is BMI accurate for everyone?
A: BMI may not accurately reflect body fat percentage in athletes (who may have high muscle mass), the elderly (who may have lost muscle mass), or certain ethnic groups.
Q2: What are the limitations of BMI?
A: BMI doesn't distinguish between muscle and fat, doesn't account for fat distribution, and may not be appropriate for children, pregnant women, or very muscular individuals.
Q3: How often should BMI be measured?
A: For adults, annual measurement is typically sufficient unless there are specific health concerns. More frequent monitoring may be needed during weight loss/gain programs.
Q4: Are there different BMI categories for different populations?
A: Some countries have adopted lower BMI thresholds for overweight and obesity for Asian populations due to differences in body composition and disease risk.
Q5: What should I do if my BMI indicates I'm overweight or obese?
A: Consult with a healthcare provider for a comprehensive assessment and personalized advice. BMI is just one indicator of health.