In an oil sample analysis calculator (100) for analyzing results of oil samples from an engine, the oil sample analysis calculator (100) includes an input module (110) which receives an input data set (140), a processing module (130) which receives the input data set (140) from the input module (110) and corrects the input data set (140) based on at least one of an amount of oil added to the engine and an amount of oil removed from the engine, and an output module (120) which receives the input data set (140) corrected by the processing module (130) and outputs an output data set (150).