The correlation between the BMI and body fatness is fairly strong, but even if 2 people have the same BMI, their level of body fatness may differ. How good is BMI as an indicator of body fatness? The standard weight status categories associated with BMI ranges for adults are shown in the following table.įor children and teens, the interpretation of BMI depends upon age and sex.įor adults, the interpretation of BMI does not depend on sex or age. These categories are the same for men and women of all body types and ages. How is BMI interpreted for adults?įor adults 20 years old and older, BMI is interpreted using standard weight status categories. Furthermore, many of these methods can be difficult to standardize across observers or machines, complicating comparisons across studies and time periods. However, these methods are not always readily available, and they are either expensive or need to be conducted by highly trained personnel. Other methods to measure body fatness include skinfold thickness measurements (with calipers), underwater weighing, bioelectrical impedance, dual-energy x-ray absorptiometry (DXA), and isotope dilution 1,2,3. To see the formula based on either kilograms and meters or pounds and inches, visit How is BMI calculated? What are some of the other ways to assess excess body fatness besides BMI?

BMI can be used as a screening tool for body fatness but is not diagnostic. Because calculation requires only height and weight, it is inexpensive and easy to use for clinicians and for the general public. Why is BMI used to measure overweight and obesity?īMI can be used for population assessment of overweight and obesity.

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