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

Unmet need

Married women of reproductive age who want to stop or delay childbearing but use no method.

Base MWRA

Total married women of reproductive age in the survey base.

CPR %

Current contraceptive prevalence among the same base, in percent.

Unmet need %

Unmet need as a percent of the base.

Total demand %

Contraceptive prevalence plus unmet need percent.

Demand satisfied %

Share of total demand met by current use, in percent.

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.

• Parity Distribution Percent Calculator

  Convert counts of women at each parity into a percentage distribution of all women.

• Primary Infecundity Percent Lookup

  Compute the percentage of women with primary infecundity and classify it as low below 2.5 percent, moderate from 2.5 to 5 percent, or elevated above 5 percent.

• 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.