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The term fecundability is an important biological determinant of fertility, which regulate the actual number of children produced by the female. Since fecundability is the monthly chance of conception thus it can be defined as inverse of the waiting time required for a conception, but this time cannot be measured directly and due to this reason birth interval can be used. The paper deals with the estimation of fecundability from the data of waiting time to first conception, i.e., 9 months smaller (on average) than the first birth interval through life table technique. The relevant data is extracted from the National Family Health Survey-III. The result reveals that fecundability increase as the age at marriage of a female increases. It is observed from the data that urban and Muslim females are more fecundable than their counterparts i.e. rural and Hindu females.

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