Look here for TEE, REE, etc. FM is fat mass, FFM is fat free mass. If you have estimated your bodyfat level you already know your fat mass. If for example you weigh 180lbs and you are 15%, then your FM is 180*0.15 = 27lbs. The rest of it, 180-27=153lbs is your Fat Free Mass, FFM. Yes, FFM...