The natural population growth rate refers to the increase or decrease in a population’s size based solely on the balance between births and deaths, excluding migration. It is calculated by subtracting the crude death rate (the number of deaths per 1,000 people per year) from the crude birth rate (the number of births per 1,000 people per year). This measure reflects the demographic vitality of a region, showing how much the population is growing or shrinking due to internal factors like fertility rates, life expectancy, and health conditions. A positive natural growth rate indicates a population expanding due to more births than deaths, while a negative rate suggests population decline. This metric is crucial for understanding long-term population trends, shaping policies on resources, health, and education, and addressing the challenges of ageing populations or rapid growth in different regions.