Population Density Calculator

Population density is people divided by land, and this page reports it in both of the units the figure is normally quoted in. Enter a population and an area in square kilometres, square miles, hectares, acres or square metres and it returns the density per square kilometre, per square mile and per hectare, along with the land each person gets. Give an arable or habitable area as well and it adds the physiological density, which divides the same population by the land that is actually usable. It also runs the other way, turning a density and an area back into a population.