Abstract: A relatively small, compact, portable, hand-held, pre-programmed, dedicated, automatic calculator for dietary fat control, having a limited number of data enter keys, a cusom program, a memory for storing user-entered data, said program, and user prompts, a command and control system for executing said program to solve and evaluate automatic mathematical equations, and a display panel for showing user prompts, user-entered data and final results. With a first program the calculator solves for the percentage of fat calories, and evaluates for per serving contained in a given food item under evaluation using fat grams and total calories as inputs.