What is the BMI formula?
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BMI (Body Mass Index) is calculated by dividing weight in kilograms by height in meters squared: BMI = weight(kg) / height²(m). For imperial units, the formula is: BMI = 703 × weight(lbs) / height²(inches).
What is a healthy BMI range?
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According to the World Health Organization (WHO), a healthy or normal BMI is between 18.5 and 24.9. Below 18.5 indicates underweight, 25–29.9 indicates overweight, and 30 or above indicates obesity.
Is BMI accurate for everyone?
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BMI is a useful population-level screening tool, but it has limitations for individuals. It does not differentiate between fat mass and muscle mass, so athletes may show a high BMI despite being healthy. It may also be less accurate for the elderly, children, and pregnant women.
What health risks are associated with abnormal BMI?
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Being underweight (BMI < 18.5) can indicate malnutrition, weakened immune function, or eating disorders. Being overweight or obese (BMI ≥ 25) is associated with increased risk of type 2 diabetes, heart disease, hypertension, certain cancers, and sleep apnea. However, a single BMI reading should not be the sole basis for health decisions.
Is my data stored or sent anywhere?
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No. All calculations are performed directly in your browser using JavaScript. No data is ever transmitted to our servers. Your privacy is fully protected — boxetool never collects or stores personal health information.