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BMI Calculator

Use this calculator to check your body mass index (BMI) and find out if you're a healthy weight. Or you can use it to check your child's BMI.

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What is BMI? – BMI definition

Body Mass Index (BMI) is a measurement of a person’s weight with respect to his or her height. A high BMI can be an indicator of high body fatness.

BMI can be a screening tool, but it does not diagnose the body fatness or health of an individual. To determine if BMI is a health risk, a healthcare provider performs further assessments. Such assessments include skinfold thickness measurements, evaluations of diet, physical activity, and family history.

Interpreting BMI

For adults 20 years old and older, BMI is interpreted using standard weight status categories. These categories are the same for men and women of all body types and ages.

For children and teens, BMI is age- and sex-specific and is often referred to as BMI-for-age. In children, a high amount of body fat can lead to weight-related diseases and other health issues. Being underweight can also put one at risk for health issues.

A high BMI can indicate high body fatness. BMI does not measure body fat directly, but BMI is correlated with more direct measures of body fat 1,2,3