Abstract: A calculator for use by an individual on a strict diet such as a diabetic to expedite food item selection for a complete single meal in accordance with a predetermined calorie, carbohydrate, protein and fat diet plan. The device includes a plurality of smaller diameter circular discs having viewing apertures rotatably affixed to a larger disc which cooperate for rapid selective registration of complete daily meals from a plurality of entrees or primary foods, the device including daily meal plans for breakfast, lunch and dinner. The device, through movement of the discs, also allows for individual food item exchange per meal in accordance with a particular dietetic plan to allow the individual a variety in the selection of food items to be consumed.