Demographic equation is the formula which is used for the purpose of calculating the changes in population. The demographic equation in order to identify the increase and decrease in population is birth-minus death plus (or minus) the net migration. Demographic equation is the mathematical tool which is used to fund the changes in population. Different businesses make use of the demographic equation for the purpose of marketing. Demographic equation is the best measure which is used to monitor any change in the population of the specific area.