Calorie Calculator Mifflin-St Jeor Equation: BMR for men = 10 X Weight + 6.25 X Height - 5 X Age + 5. BMR for women = 10 X Weight + 6.25 X Height - 5 X Age - 161. Harris-Benedict Equation: BMR for men = 13.397 X Weight + 4.799 X Height - 5.677 X Age + 88.362. ... Katch-McArdle Formula: BMR = 370 + 21.6(1 - Body Fat) X Weight.