Methods for calculating alcohol doses in humans usually do not take into account male-female differences in the proportion of body weight that is water or beverage type. Those methods that do account for such differences are either expensive or difficult to use. The first study describes the results of a computer program, written in BASIC, that targets specific peak blood alcohol concentrations in males and females. The program is flexible, easy to use and accurate. The second study examines the capability of raters to correctly identify the sobriety of targets subjects and make determinations of their ability to drive. Sober raters were unable to reliably identify intoxicated subjects with greater that chance accuracy except when the blood alcohol concentrations were above 150 mg/dl.