BMI Calculator

BMI Calculator

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    BMI Range Category
    Less than 16 Severely underweight
    From 16 to 18.5: Underweight
    From 18.5 to 25 Normal (healthy weight)
    From 25 to 30 Overweight
    From 30 to 35 Obese Class I (Moderately obese)
    From 35 to 40: Obese Class II (Severely obese)
    Over 40 Obese Class III (Very severely obese)
    View more information about BMI

Obesity & BMI

Obesity is determined by measurement of body fat, not merely body weight. People might be over the weight limit for normal standards, but if they are very muscular with low body fat, they are not obese.

Others might be normal or underweight, but still have excessive body fat. Different measurements and factors are used to determine whether or not a person is overweight to the degree that it threatens health:

  • Body mass index ( BMI ) (a measure of body fat).
  • Waist circumference.
  • Waist-hip ratio.
  • Anthropometry.
  • The presence or absence of other disease risk factors (e.g., smoking, high blood pressure, unhealthy cholesterol levels, diabetes, relatives with heart disease) in addition to obesity.

Such risk factors plus BMI may be the most important components in determining health risks with weight.

Your body mass index (BMI) is a simple math calculation that determines your weight-to-height ratio.