Summaryīody mass index (BMI) is a calculation that estimates a person’s body fat using their height and weight. Though this can give the healthcare professional a snapshot of a person’s health based on a person’s weight, it doesn’t consider other factors, such as age, sex, race, genetics, fat mass, muscle mass, and bone density. For example, Asian men and women have been shown to be at a higher risk of heart disease at a lower BMI, compared with non-Asians ( 3). Some countries have adopted this BMI scale to better represent the size and stature of their populations. Once BMI is calculated, it’s then compared to the BMI scale to determine whether you fall within the “normal” weight range ( 2):Īccording to this calculation, a healthcare professional may suggest health and lifestyle changes if you don’t fall within the “normal” weight category. You can also use an online BMI calculator, such as the one provided by the National Institutes of Health. ![]() BMI = (weight (lbs) / height (in 2)) x 703.The BMI scale is based on a mathematical formula that determines whether a person is of a “healthy” weight by dividing their weight in kilograms by their height in meters squared ( 1):Īlternatively, BMI can be calculated by dividing weight in pounds by height in inches squared and multiplying by 703: Nevertheless, it’s widely used to measure individuals’ health ( 1). Interestingly, Quetelet stated that BMI was not useful in studying single individuals but rather in giving a snapshot of a population’s overall health. He developed the BMI scale to quickly estimate the degree of overweight and obesity in a given population to help governments decide where to allocate health and financial resources ( 1). " Healthy Weight," Centers for Disease Control and Prevention.“BMI” stands for “ body mass index.” The BMI was developed in 1832 by a Belgian mathematician named Lambert Adolphe Jacques Quetelet ( 1)." Body Mass Index," Wikipedia, The Free Encyclopedia.Calculate normal weight range in US units:.Maximum weight (kg) = 24.9 × height 2 (m) Minimum weight (kg) = 18.5 × height 2 (m) Calculate normal weight range in metric units:.To calculate your normal weight range use the following formulas: If you are concerned about your weight, it is best to consult with your doctor or healthcare professional.įor additional information about the BMI calculation see our BMI is one of several tools used to assess a person's weight and overall health. ![]() Keep in mind that BMI is a ratio between height and total body weight - it does not differentiate between weight from muscle and weight from fat, nor does it consider an individual's type of body frame. Children and adolescents are not evaluated using these thresholds but are evaluated relative to other children of the same age and gender.For example, in Singapore and Hong Kong a BMI of 23.0 is considered overweight, whereas in the United States a BMI of 25 is considered overweight. In many Southeast Asian countries, the thresholds for the overweight and obese categories tend to be lower.It is calculated as kg per square meter or pounds per square inch of height.Īlthough BMI is calculated the same way for all ages internationally, the way BMI is interpreted depends on country location and the person's age. The body mass index or BMI is a ratio of mass to height. Then divide weight by total inches squared, and multiply the result by 703.īMI of 26.4 puts Stella in the overweight BMI category. What is her BMI?įind total inches by multiplying 5 * 12 and add 10. Stella weighs 184 lb and is 5 feet, 10 inches tall. Referencing the charts above you can see that aīMI of 17.7 puts Matilda in the underweight BMI category. Matilda weighs 64 kg and is 1.9 meters tall. The US BMI formula is:īMI = weight (lb) ÷ height 2 (inches) * 703 Example BMI Calculation in Metric Units Using US units, where weight is in pounds and height is in inches, divide weight by inches squared. ![]() Using metric units, where weight is in kilograms and height is in meters, divide weight by meters squared. Examples of How to Calculate BMI Using the Formulas
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