Enter the number of births, the number of deaths, and the population size into the Net Reproductive Rate Calculator. The calculator will evaluate the Net Reproductive Rate. 

Net Reproductive Rate Formula

The following formula is used to calculate the Net Reproductive Rate. 

NRR = (B-D) / P * 100

  • Where NRR is the Net Reproductive Rate (%)
  • B is the number of births 
  • D is the number of deaths 
  • P is the population size 

How to Calculate Net Reproductive Rate?

The following two example problems outline the steps and information needed to calculate the Net Reproductive Rate.

Example Problem #1

  1. First, determine the number of births.
    • The number of births is calculated to be : 5,000.
  2. Next, determine the number of deaths. 
    • The number of deaths is measured to be: 3,000.
  3. Next, determine the population size. 
    • The population size is found to be: 100,000.
  4. Finally, calculate the Net Reproductive Rate using the formula above: 

NRR = (B-D) / P * 100

The values provided above are inserted into the equation below and computed.

NRR = (5000-3000) / 100,000 * 100 = 2.00 (%)


Example Problem #2

The variables required for this problem are provided below:

number of births = 5,000

number of deaths = 4,000

population size = 200,000

Test your knowledge using the equation and check your answer with the calculator.

NRR = (B-D) / P * 100 = (%)