What is the difference between GRR and NRR?

GRR ignores female mortality before completing childbearing, while the Net Reproduction Rate (NRR) adjusts for this. NRR = GRR × fraction of daughters surviving to reproductive age. An NRR of 1.0 indicates exact replacement.

How do you calculate GRR from TFR?

GRR = TFR × (proportion of female births). The proportion of female births is typically about 0.4886 (sex ratio 105 males per 100 females at birth). So GRR ≈ TFR × 0.4886.

Gross Reproduction Rate (GRR)

Calculate the Gross Reproduction Rate (GRR) — the average number of daughters a woman would bear during her lifetime under current age-specific fertility rates. GRR = TFR × (proportion of female births).

Data set — comma or newline separated

Statistical Results — n = 8

Count (n)8

Sum (Σx)40

Min2

Max9

Range7

Q14

Q35.5

IQR1.5

Mean (μ)5

Median4.5

Mode4

Pop. Variance (σ²)4

Pop. Std Dev (σ)2

Sample Variance (s²)4.571428571

Sample Std Dev (s)2.138089935

Skewness0.65625

Excess Kurtosis-0.21875

How to Use

Enter the values for the scenario you are assessing. Calculate the Gross Reproduction Rate (GRR) — the average number of daughters a woman would bear during her lifetime under current age-specific fertility rates. GRR = TFR × (proportion of female births). Use the grr calculator result to inform your calculation.

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Gross Reproduction Rate (GRR)

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Frequently Asked Questions

What is the difference between GRR and NRR?

How do you calculate GRR from TFR?