Most of the current available information for average life expectancy is based on the assumptions that the person in question would be expected to live an average life span and that his or her health/medical/survival status is no different from that of an “average” individual. The use of appropriate life expectancy tables is extremely important when calculating economic losses whether one is considering medical costs, lost wages, or pension liability. The life expectancy of a particular individual may be different than that indicated in the general life tables, either because of the tort itself, or due to a medical condition present prior to the tort. Such evidence can often be provided by a competent physician or other medical expert, but in the absence of such information it may be necessary for the researchers to estimate mortality rates and life expectancy based upon published data. This paper provides an explanation for researchers to compute reasonable precise estimates of life expectancies for those with specific diseases or afflictions.