Age: age also has an influence, since older individuals need less energy than younger ones.Sex: sex is a conditioning factor, hence there is one formula for men and another for women.The aspects to be considered that have an impact on BMR are the following: Should be calculated from time to time in order to have an accurate knowledge of the current reality. Factors Influencing the calculation of BMR (Basal Metabolic Rate) It consists of the following equation:īMR=370+(21'6 x Lean Mass). The Harris Benedict formula, published in 1919 and later revised in 1984, is the following:īMR= 88.362 + (13.397 × weight in kg) + (4.799 × height in cm) - (5.677 × age in years) (Men)īMR= 447.593 + (9.247 × weight in kg) + (3.098 × height in cm) - (4.330 × age in years) (Women)īased on this formula, which was later revised in 1990, the Mifflin-St Jeor formula was created.īMR = (10 x weight in kg) + (6.25 x height in cm) - (5 x age in years) + 5 (Men)īMR = (10 x weight in kg) + (6.25 x height in cm) - (5 x age in years) - 161 (Women)Īnd finally, another formula, even more accurate, is the Katch-McArdle formula, which is the only one that takes into account the percentage of body fat, and which also works for both sexes. In this calculator you can choose the one you prefer. There are several formulas used for this purpose. To calculate the Basal Metabolic Rate, a series of equations are performed involving the person's sex, age, weight and height as variables.
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