Fertility rate is a term that is widely used to refer to the number of live births per thousand women of reproductive age within a population. However, there are other terms that are sometimes used interchangeably with fertility rate, including crude birth rate, birth rate, and reproduction rate. Crude birth rate is a statistic that is calculated by dividing the number of births in a population by the total population and multiplying by 1000. Birth rate refers to the number of live births that occur in a given year per 1000 population. Reproduction rate takes into account the number of offspring produced by each woman in a particular population. While these terms may have slightly different meanings, they all refer to the same basic concept - the ability of a population to produce new offspring.