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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 the weight in kilograms divided by the square of the height in meters.
The calculator uses the standard BMI formula:
Where:
Interpretation: The result is categorized according to WHO standards:
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, height in meters. For most accurate results, measure weight without heavy clothing and height without shoes. Age and gender are optional factors that can provide more personalized interpretation.
Q1: Is BMI accurate for everyone?
A: BMI may not accurately reflect body fat in athletes (who may have high muscle mass), the elderly (who may have lost muscle mass), or certain ethnic groups.
Q2: How does age affect BMI interpretation?
A: For adults, BMI interpretation is generally consistent across age groups. However, for children and teens, BMI is age- and sex-specific.
Q3: 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 suitable for certain populations.
Q4: Should BMI be used alone to assess health?
A: No, BMI should be used as a screening tool along with other assessments like waist circumference, diet, physical activity, and family history.
Q5: How often should I check my BMI?
A: For most adults, checking BMI every 6-12 months is sufficient unless you're actively trying to change your weight.