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Body Mass Index Web Calculator
Note: A BMI greater than 25 may or may not be due to increases in body fat. For example, professional athletes may be lean and muscular, with little body fat, yet they may weigh more than individuals with the same height because of their muscle mass regardless of BMI.
Note for children:
BMI is age and gender specific. Because BMI changes substantially as children get older, BMI-for-age is the measure used for children ages 2 to 20 years. BMI-for-age is plotted on growth charts by healthcare professionals.
These calculators require a JavaScript-enabled Web browser to operate. Alternately, you may make use of the mathematical formulas.
Calculate your BMI
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Your weight at a desired BMI
Adult BMI Classifications*
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| BMI | Classification |
| <18.5 | Underweight |
| >=18.5 & < 25 | Normal Weight |
| >=25 & < 30 | Overweight |
| >=30 & < 35 | Class 1 Obesity |
| >=35 & < 40 | Class 2 Obesity |
| >=40 | Class 3 Obesity |
*21 and older, male or female |
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Every effort will be made to update the information contained on these pages as necessary. However, it is the responsibility of the user to determine that he or she is relying on the most current version of any particular information. Any questions about the material should be directed to the referenced office or department.
