Determine your body fat baseline. Record the weight readings & body fat readings for 7 to 10 days. Total your weight & body fat percentage (one total for each category). Divide each total by the number of days you had monitored your readings for. For example: Baseline weight: 135 + 136 + 138 = 409: 409/3 = 136.3 AND Body Fat %: 23% +24% + 23% = 70: 70/3 = 23.3%