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BMI Formula:
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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 (kg/m²).
The calculator uses the standard BMI formula:
Where:
Interpretation: The calculated BMI value is then compared against standard 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 height, you can convert from cm to m by dividing by 100 (e.g., 175 cm = 1.75 m). All values must be valid (weight > 0, height > 0).
Q1: Is BMI accurate for everyone?
A: BMI is a useful screening tool but has limitations. It may overestimate body fat in athletes and those with muscular builds, and underestimate body fat in older persons who have lost muscle mass.
Q2: What are the health risks associated with high BMI?
A: Higher BMI is associated with increased risk of heart disease, stroke, type 2 diabetes, certain cancers, and other health conditions.
Q3: Does BMI apply to children?
A: BMI for children and teens is interpreted differently, using age- and sex-specific percentiles rather than the adult categories.
Q4: What are alternatives to BMI?
A: Other measures include waist circumference, waist-to-hip ratio, and body fat percentage measurements.
Q5: How often should I check my BMI?
A: For most adults, checking BMI annually is sufficient unless you're actively trying to lose or gain weight.