The Zone Prescription Calculator uses your lean body mass, multiplies it by .7 grams of protein for each pound of LBM, and then divides this number by a value that is set for your activity level for that day. For anyone entering the Zone it is recommended that they use the baseline measurement.  The baseline is the default option in our calculator. As you advance in the diet you can start to increase your block count based on the number of workouts or increased activity you do per day.