S = 1 for male and 0 for female. BMI = Body Mass Index. Age = Age in years. BFP Formula for Adults. This BF% formula is based on the heritage study The effect of sex, age and race on estimating percentage body fat from body mass index: The Heritage Family Study. BFP = (1.39 * BMI) + (0.16 * Age) - (10.34 * S) - 9. Where: S = 1 for male and 0 The Body Mass Index of 27.68 is derived from the weight of 80 kilograms divided by the square of height 170 centimeters. You are weighing 8.04 kg more than the healthy or optimum weight. Burning more calories or reducing the excess weight 8.04 kg by your proper diet & exercises can brought your weight to 71.96 kg in order to get your BMI score What is the Ideal Weight for 157 cm Female in kg? The answer is 49.7 kg. 170 cm: 53.5 kg - 72.3 kg: 61.4 kg: 171 cm: 54.1 kg - 73.1 kg: 62.3 kg: FAQ. What is the * according to Body Mass Index (BMI) classification a weight between 55.4 kilograms and 74.8 kilograms for a height 173 cm Male is considered to be of a Healthy/Normal Weight 47.9 68.7 kg NBTd.