On this page, you can calculate the number of units of insulin to adjust a dose, based on the trend arrows of your CGMS (Dexcom G6®, Medtronic Enlite 2®/Guardian 3™, or FreeStyle Libre® 1 or 2) and your correction/sensitivity factor (ISF, in mmol/L or mg/dL). Alternatively, using your carb ratio (in grams), you can adjust your carbohydrate intake to offset the predicted rise or fall in blood glucose with time. These calculations are only to be used pre-meals and -snacks, and 3 hours or more hours after the previous insulin dose was given, to avoid insulin stacking. These calculations are not valid for use in children under the age of 2 years. Calculations do not account for active insulin/insulin-on-board, nor for activity! Based on Laffel LM et al. J Endocr Soc 2017;1(12):1461–1476.