BMI is a quick and low-cost approach to estimating your body fat percentage. Depending on your weight and size, you may use this figure to determine if you are a healthy weight for your height. The more fat a person has, the higher their number will be. In addition, a person's risk of developing diseases including heart disease, diabetes, and cancer may be estimated with the use of the BMI calculation. A person's BMI is determined by multiplying their weight in kilograms by their height in meters squared. This calculation may be handled for you by our BMI calculator. There is a corresponding weight-group category for each person's results. A BMI of less than 18.5 indicates that a person is considered underweight. Body Mass Index (BMI): 18.5–24.9 = Normal Overweight is defined as a BMI of 25 to 29.9 Obesity is defined as a BMI of 30 or greater. Limitations The BMI is a good indicator of total body fat for most people, but it doesn't work for everyone. Although they may not be obese, bodybuilders and other strong persons may have a high body mass index (BMI) due to their size. BMI may underestimate body fat in persons with decreased muscular mass, such as older adults. The identical method is used for children and teenagers, but the results are interpreted differently because of the age and gender differences. You should consult with your child's doctor if you have any concerns regarding their height or weight.