Sometimes this common equation is also seen written using imperial units: Ideal Body Weight = 48 kg + (2.7 × (height – 60))
Some people suggest that this formula can be adjusted for body frame by increasing by 10% for those with a large body frame or decreasing by 10% for those with a small body frame. The base equation assumes a medium frame. However, the Hamwi equation also uses body frame in predicting ideal body weight. The Hamwi formula is very similar to the Devine formula. To convert this to pounds, multiply by 2.2. So, in this formula, a 5’5″ female would have an IBW of: This equation was initially based on estimates of ideal body weight and not population studies. The Devine Formula uses sex and height to determine ideal body weight. This is still one of the most commonly used formulas to calculate ideal body weight in clinical practice today. Devine in 1974 to allow estimation of drug clearances in obese patients. The first IBW equation was introduced by Ben J. Since these formulas all give similar results, any one of these equations may be used to estimate IBW. These ideal body weight equations all share a general agreement among the different height-weight tables from which they were based. Most of the ideal body weight formulas were derived using population data and weight trends.
Interestingly, these equations were first introduced to estimate drug metabolism and clearance from the body as research has found that these factors relate more to ideal body weight than actual total body weight. Several different formulas have been developed over the years to estimate ideal body weight. Ĭalculating what your IBW is one piece of information that you can use to ensure you are maintaining a healthy weight. On the other hand, obesity is associated with an increased prevalence of cardiovascular disease, hypertension, diabetes, and even certain forms of cancer. Maintaining a healthy body weight is associated with a decreased risk of chronic health issues and early mortality. This value is corresponds to a favorable nutrition status. During pregnancy and lactation, a woman's body composition changes, so using BMI is not appropriate.įor more information, visit Health Canada's Canadian Guidelines for Body Weight Classification in Adults.Ideal body weight (IBW) is an estimate of an individual’s healthy weight based on certain parameters, most notably height and gender. Those with a lower muscle mass, such as children who have not completed their growth or the elderly who may be losing some muscle mass may have a lower BMI. Those with a higher muscle mass, such as athletes, may have a high BMI but not be at greater health risk. This is because BMI does not take into account whether the weight is carried as muscle or fat, just the number. Who shouldn't use a BMI calculatorīMI is not used for muscle builders, long distance athletes, pregnant women, the elderly or young children. The formula is BMI = kg/m 2 where kg is a person’s weight in kilograms and m 2 is their height in metres squared.Ī BMI of 25.0 or more is overweight, while the healthy range is 18.5 to 24.9.
Body Mass Index is a simple calculation using a person’s height and weight.
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