Loss of sucrose in final molasses is a major financial loss to a sugar factory; all efforts are to be made to curtail this loss. The apparent purity concept is unable to quantify the degree of molasses exhaustion but the Target Purity Formula can be used as bench mark to fulfill this purpose. Target Purity formula is a function of mono saccharides and inorganic components. A number of Target Purity Formulas have been presented in the past. Thirty tests of analysis of molasses exhaustion were collected from various sugar mills of the country in three years. All available Target Purity Formula applied on these tests to find an appropriate formula which can be used to quantify the exhaustion of final molasses for our country. Evaluating some of the Target Purity Formulas, a new formula is being planted (40.86-14.60 log Rs/A) and checked against all thirty tests analysis of final molasses exhaustion and found suitable for our country.