General feility rate is the number of live bihs per 1000 women in the reproductive are group ( 15-44 or 49 years) in a given year GFR = number of live bih in an area during the year X 1000/ mid year female population age group 15-44 (or 49) in the same area in same year General feility rate is a better measure of feility than the crude bih rate because the denominator includes the number of women in the child bearing age rather than the whole population Reference : Park&;s textbook of preventive and social medicine, 23rd edition, Page no: 488