Bmi calculator in women3/30/2024 ![]() When the term BMI is used informally, the units are usually omitted.īMI provides a simple numeric measure of a person's thickness or thinness, allowing health professionals to discuss weight problems more objectively with their patients. If pounds and inches are used, a conversion factor of 703 (kg/m 2)/(lb/in 2) must be applied. The BMI is universally expressed in kg/m 2, resulting from mass in kilograms and height in metres. Nevertheless, due to its simplicity, it has come to be widely used for preliminary diagnoses. Additional metrics, such as waist circumference, can be more useful. Keys explicitly judged BMI as appropriate for population studies and inappropriate for individual evaluation. The interest in an index that measures body fat came with observed increasing obesity in prosperous Western societies. In this paper, Keys argued that what he termed the BMI was ".if not fully satisfactory, at least as good as any other relative weight index as an indicator of relative obesity". HistoryĪdolphe Quetelet, a Belgian astronomer, mathematician, statistician, and sociologist, devised the basis of the BMI between 18 as he developed what he called "social physics". The modern term "body mass index" (BMI) for the ratio of human body weight to squared height was coined in a paper published in the July 1972 edition of the Journal of Chronic Diseases by Ancel Keys and others. The dashed lines represent subdivisions within a major class.īMIs under 20 and over 25 have been associated with higher all-causes mortality, with the risk increasing with distance from the 20–25 range. ![]() ![]() Commonly accepted BMI ranges are underweight (under 18.5 kg/m 2), normal weight (18.5 to 25), overweight (25 to 30), and obese (over 30).Ī graph of body mass index as a function of body mass and body height. That categorization is the subject of some debate about where on the BMI scale the dividing lines between categories should be placed. The BMI is a convenient rule of thumb used to broadly categorize a person as underweight, normal weight, overweight, or obese based on tissue mass (muscle, fat, and bone) and height. The BMI may be determined using a table or chart which displays BMI as a function of mass and height using contour lines or colours for different BMI categories, and which may use other units of measurement (converted to metric units for the calculation). The BMI is defined as the body mass divided by the square of the body height, and is universally expressed in units of kg/m 2, resulting from mass in kilograms and height in metres. doi:10.1097/MED.Body mass index ( BMI) is a value derived from the mass (weight) and height of a person. Current body composition measurement techniques. Race-Ethnicity-Specific Waist Circumference Cutoffs for Identifying Cardiovascular Disease Risk Factors. Zhu S, Heymsfield SB, Toyoshima H, Wang Z, Pietrobelli A, Heshka S. National Heart, Lung, and Blood Institute. What’s New in Understanding the Risk Associated With Body Size and Shape? Pears, Apples, and Olives on Toothpicks. Golzarri-Arroyo L, Mestre LM, Allison DB. Ethnic Differences in BMI and Disease Risk. Body Mass Index Versus Body Fat Percentage in Prospective National Football League Athletes: Overestimation of Obesity Rate in Athletes at the National Football League Scouting Combine. Provencher MT, Chahla J, Sanchez G, et al. ![]() Those who carry weight around the middle-what's called an “apple” body shape-have higher health risks than people with a "pear" shape (those who accumulate weight in the hips and thighs).Ĭenters for Disease Control and Prevention. Body shape: Evidence suggests that where body fat is located matters.Race/ethnicity: Body fat proportions can vary by race, meaning that BMI scores can mean very different things if you are Asian (who have greater proportional body fat than Whites at the same BMI) or White (who have greater proportional body fat than Blacks at the same BMI).For example, a BMI below 23 in someone over 75-which is in the "normal" range for adults-is associated with a higher risk of mortality (death), while being in the “overweight” range is not. Age: BMI may not accurately predict health risks for young and old people. ![]() Therefore, a woman in a “safe” category may be at higher risk of heart disease and other conditions than her male counterpart of the same BMI. Sex: Females tend to have more body fat than males.It can also underestimate body fat in people with very little muscle mass. Muscle mass: Because BMI cannot distinguish between fat and muscles, it can overestimate body fat in athletes or individuals with lots of muscle mass. ![]()
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