An apparatus and method to calculate and display future performance of an individual using user-inputted information so that it can be anticipated when the individual will be at maximum and minimum performance levels based on user-inputted information, and strategic decisions can be made as to whether or not to use the individual in a military operation, athletic event, or other like situation requiring heightened performance. Future performance may be calculated for a group of individuals to predict when the group will be at maximum and minimum performance levels.