Calculations which show the future development of a population when certain assumptions are made about the future course of population change, usually with respect to fertility, mortality, and migration. They are in general purely formal calculations, developing the implications of the assumptions that are made.

An approximation of the population of a geographic unit at a point in the future based on specific assumptions regarding future demographic trends in the geographic unit.

Estimates of the future size and characteristics of a population, based on the pattern of past trends and the predicted future pattern of births, deaths, migration and land availability.

computation of future changes in population numbers, given certain assumptions about future trends in the rates of fertility, mortality, and migration. Demographers often issue low, medium, and high projections of the same population, based on different assumptions of how these rates will change in the future.

are illustrations of the growth and change in the population which would occur if specific assumptions about future demographic trends prevail over the projection period. Projection results published by the ABS are not intended as predictions or forecasts. Series II is based on three differing levels and assumptions: high level fertility rates low level overseas migration mortality rates falling by an average of 40% by the year 2051.

Estimates of the population for future dates. They illustrate plausible courses of future population change based on assumptions about future births, deaths, international migration, and domestic migration. Projections are based on an estimated population consistent with the most recent decennial census as enumerated. While projections and estimates may appear similar, there are some distinct differences between the two measures. Estimates usually are for the past, while projections typically are for future dates. Estimates generally use existing data, while projections must assume what demographic trends will be in the future. For more information: http://www.census.gov/population/www/projections/aboutproj.html Related term: Population estimate (Population Estimates Program)