Use the formula: Rate of population growth = ((Population at end − Population at start) / Population at start) × 100
Identify the starting population
Identify the ending population
Subtract the starting population from the ending population
Divide the result by the starting population
Multiply by 100 to get the percentage growth rate
If needed, include births, deaths, immigration, and emigration in the population change calculation
Use the formula: Population change = Births + Immigration − Deaths − Emigration
Use the formula: Growth rate = (Population change / Initial population) × 100
Express the final answer as a percentage per time period
Make sure both population values refer to the same time interval