Weight (lb) = (5 x BMI target) + (BMI target / 5)) x (Height (in) - 60 in) The formula for imperial metrics is not used in our calculator, but is given here for reference: We use a value of 22 in this online tool.įor a target BMI of 20 the formula looks like so: Ideal weight (kg) = 44 + 70 x (Height (m) - 1.5 m), while for the value of 22 we use as default it becomes 48.4 + 77 x (Height (m) - 1.5 m) Weight (kg) = 2.2 x BMI target + 3.5 x BMI target x (Height (m) - 1.5 m)īMI target is the target BMI for the calculation. IBW formula that is more accurate for all intents and purposes than the outdated Devine formula. Ideal weight formulaĪs described above, we use the Peterson at al. We also show the result from the Devine formula for comparison. When input is in feet and inches, we convert it to metric, use the metric formula, then convert it back to imperial due to the greater accuracy. as a primary output for our ideal weight calculator. Given the above, we decided to use the formula proposed by Peterson et al. In terms of mean absolute error - it was 1.1 lbs and 0.4 kg for the imperial and metric versions, respectively, as estimated via the empirical data. The maximum percent error across the 95% height range was found to be 2.4% and the equation is most accurate at the middle of the range. Its accuracy was evaluated through theoretical and empirical means (the latter by applying it to historical data from adults, participating in the 1999-2006 NHANES). produced in 2016 a novel body weight equation that is more accurate than past IBW equations and is generalizable to any target BMI and height. In attempting to address these shortcomings of the Devine and later formulas, Peterson at al. BMI ranges for healthy body weight are often used instead. These issues make IBW equations as a whole incompatible with BMI and combined with the fact that they only prescribe a single value makes them not very suitable, even for their intended purpose. The issue was not really solved by the formulas provided by the works of Robinson et al. Validation of the formula's results versus actual lean body mass and average body mass revealed that the formula's results are skewed at both ends of the spectrum - they underestimate body weight at shorter heights and overestimate it for persons of higher stature. but was based on estimates from Devine's mentor. Unlike other health formulas, it was not derived from any kind of systematic research, regression analysis, etc. The major issue with the Devine formula is that it is not scientific. It is the one used in many IBW calculators, but in our ideal body weight calculator we chose a different approach and we will explain why (we also show the Devine formula result, for reference). Devine published his famous equation which basically converted a simple rule based on the Broca ideal body weight formula from pounds to kilograms. There are multiple formulas for calculating ideal body weight, with the first being invented as early as 1871 by Dr. Applications of Ideal Body Weight (IBW) estimates.Comparing the Peterson formula with the Devine formula.
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