sci.total-fertility-rate-NRR Calculator
Calculates the Net Reproduction Rate (NRR) from age-specific fertility rates and female survival probabilities: NRR = Σ l(x) × f(x) × 0.4886 (fraction female births). NRR = 1.0 is replacement fertility — Japan's NRR ≈ 0.57 implies long-run population decline of 43% per generation without immigration.
Inputs
- Tfr
- Amount per unit of time or per unit quantity. Check the denominator before interpreting.
- P Survive 15 49
- Age in completed years. Many health and fitness formulas adjust for age.
- Sex Ratio M Per F
- Reference formula or conversion factor shown for context.
Results
- net reproduction rate NRR
- The result of multiplying all input values together.
- gross reproduction rate GRR
- The result of multiplying all input values together.
- fraction of births that are female
- The value at the specified point or condition.
- NRR = TFR × p_f × survival
- Sample size or count used in the calculation.
- population trend
- The direction and rate of change in the data series.
- replacement TFR
- Sample size or count used in the calculation.
fertility prob total rate gross