Arithmetic Density

Total number of people divided by total land area

Physiologic density

In a region, the number of people supported by a unit area of arable land

Agricultural Density

The ratio of the number of farmers to the total amount of arable land.

Doubling Time

The number of years needed to double a population, assuming a constant rate of natural increase.

Natural Increase Rate (NIR)

The percentage by which a population grows in a year.

Total Fertility Rate (TFR)

The average number of children a woman will have throughout her childbearing years.