Use this fertility measure when the births, women at risk, parity categories, and observation period follow the definition required by the selected method.

Actual TFR

Observed total fertility rate.

Wanted TFR

Wanted total fertility rate from the survey responses.

Gap

Actual minus wanted total fertility; negative when women bear fewer children than wanted.

Unwanted %

Excess fertility as a percent of observed fertility.

Period and cohort fertility answer different questions. Survey recall, parity truncation, changing age patterns, union definitions, and mismatched exposure populations can materially change the result.

Pair period fertility with cohort measures, parity distributions, or wanted-fertility indicators when available. These complementary views separate timing changes from completed family size and stated preferences.

• Completed Cohort Fertility CFF Calculator

  Sum age-specific cohort fertility rates over the reproductive years, scaled by the class width, to obtain children ever born per woman at the end of childbearing.

• Replacement Fertility With Mortality Checker

  Compute the replacement total fertility rate as the reciprocal of the product of the female birth share and female survival to the reproductive ages, then classify an observed TFR against it within a stated tolerance.

• Birth Interval Median By Parity Calculator

  Compute the median length of birth intervals in months for a set of closed intervals observed at a given parity transition.