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BMI Formula:
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Body Mass Index (BMI) is a measure of body fat based on height and weight that applies to adult men and women. It provides a reliable indicator of body fatness for most people and is used to screen for weight categories that may lead to health problems.
The calculator uses the BMI formula:
Where:
Explanation: The formula calculates body mass index by dividing weight by the square of height, then multiplying by 703 to convert to the standard metric BMI scale.
Details: BMI is a simple, inexpensive screening method for weight category—underweight, healthy weight, overweight, and obesity. It helps identify potential weight problems that may lead to health issues.
Tips: Enter weight in pounds and height in inches. All values must be valid (weight > 0, height > 0). For accurate results, measure weight and height without shoes and heavy clothing.
Q1: What are the BMI categories for adults?
A: Underweight: <18.5, Normal weight: 18.5-24.9, Overweight: 25-29.9, Obesity: 30 or greater.
Q2: Is BMI accurate for everyone?
A: BMI may overestimate body fat in athletes and those with muscular build, and underestimate body fat in older persons who have lost muscle mass.
Q3: Can BMI be used for children?
A: BMI for children and teens is interpreted differently, using age and sex-specific percentiles rather than the adult categories.
Q4: What are the health risks associated with high BMI?
A: Higher BMI is associated with increased risk of heart disease, high blood pressure, type 2 diabetes, gallstones, breathing problems, and certain cancers.
Q5: What if my BMI indicates I'm underweight?
A: Being underweight can also cause health problems including osteoporosis, decreased immune function, and fertility issues. Consult a healthcare provider.