Determine the initial population size
Determine the final population size
Determine the time period between the two measurements
Subtract the initial population from the final population
Divide the difference by the initial population
Multiply the result by 100 to get the percentage growth rate
Divide the percentage growth rate by the number of years if you need the annual growth rate
Use the formula: Growth Rate = ((Final Population – Initial Population) / Initial Population) × 100
Use the formula: Annual Growth Rate = [((Final Population / Initial Population)^(1 / Number of Years)) – 1] × 100