Body Mass Index (BMI) Calculator
Enter your height and weight to find your body mass index (BMI), which is used to determine if your weight is healthy or if excess weight increases your risk for health problems, such as cancer.
BMI can be calculated using the formula: BMI = (weight × 703) ÷ (height × height). For example, BMI = (120 × 703) ÷ (63 × 63) or 84,360 ÷ 3,969 = 21.3, which is within the healthy weight range.
For children and teens, BMI is calculated the same way as for adults, but the numbers have different meanings due to changes in body fat with age and differences between boys and girls.
The US Centers for Disease Control and Prevention (CDC) has developed age- and sex-specific growth charts to account for these differences, translating a BMI number into a percentile based on a child's sex and age.
BMI levels for children and teens are calculated using age and sex.
Author's summary: Calculate your BMI to assess your weight health.