BMI Calculator

The BMI calculator shows you an estimate of body fat based on weight and height. It is a decent indicator of your risk for weight-related diseases. A higher BMI raises your risk for heart disease, high blood pressure, type 2 diabetes, gallstones, breathing problems, and certain cancers.

BMI Weight Status
Below 18.5 Underweight
18.5 – 24.9 Normal
25.0 – 29.9 Overweight
30.0 and Above Obese

BMI calculator


BMI Chart

The Body Mass Index, or BMI chart, shows a graph of BMI related to an adult’s weight and height. It is an approximation used to determine whether a person is of normal weight, underweight, overweight or obese.

Technically, it is defined as one’s mass in kilograms divided by the square of their height in meters, and is expressed in kg/m2. In US units, BMI is a person’s weight in pounds divided by the square of their height in inches, then multiplied by 703 to account for the conversion from metric to imperial units, or lbs/in2. The BMI calculator above will do the math for you, or you can locate your weight and height on the chart below to find your BMI.

BMI Chart

BMI Limitations

While the BMI calculator will give you a general idea of whether you are overweight, BMI does have some limitations.

  1. The raw number calculated for adults is not accurate for children up to 19 years of age. An age- and gender-specific percentile graph is used to interpret BMI and determine the weight category for children and teens. See the chart below for the BMI reference for children and teens from 2-20 years old.
  2. For athletes & those with a muscular build, it may overestimate body fat.
  3. For adults 60 years old or more, and people who have lower muscle mass, it may underestimate body fat.

BMI Chart for Kids & Teens

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