The Centers for Disease Control and Prevention website offers printable charts for calculating body mass index as well as a wealth of related information. BMI is considered a screening tool, not a diagnostic of an individual's body fat or health, explains the CDC.
Body mass index is a person's weight in kilograms or pounds divided by the square of height in centimeters or inches, reports the CDC. Healthy BMI levels vary depending on an individual's stage of life and other factors.
There are alternate methods of measuring body fat, including skin fold thickness measurements, underwater weighing, bioelectrical impedance, dual-energy X-ray absorptiometry and isotope dilution, according to the CDC. These methods are often more expensive and require specialty equipment or training.