A method of analyzing a subjects demographic information and a scan of the subjects body and providing a body fat index for the subject is provided. A computer accessible data file is provided with a collection of a species body type images, demographic information associated with each body type image, and a body fat index associated with each body type image. A processor receives a scanned image of a subject and individual demographic information from that subject processes the individual demographic information to identify in the data file the body type images that correspond to the demographic information of that subject, and then processes the scanned image of that particular subject against the body type images identified as corresponding to the demographic information to determine the body type image that best matches the scanned image of the subject The processor then produces output including the body fat index for that body type image by processing the scanned image of the subject against the body type images identified from the demographic information. This will provide an affordable, reproducible, readily available method for a potentially large audience of interested prospects to accurately estimate the percentage of body fat of subjects for their particular use.