Births

Fertility

Crude Birth Rate (CBR) – the number of births
in one year in a country, divided by the country's population, and multiplied
by 1000.

Fertility rate – Number of live births, divided
by the female population of child bearing age, multiplied by 1000

Natality – birth as a component of population
change
Deaths

Mortality

Crude Death Rate (CDR) – divide the number
of deaths in one year by the population and then multiply by 1000.
Calculating change

Natural increase = births – deaths

Growth rate = Natural increase + net migration

Doubling time = the amount of time it would
take for a given population to double

The Rule of 72: 72 ÷ growth rate =
years to double

example: if a country's growth rate is 3%,
the population will double in about 24 years

example: if a country's population doubles
in 18 years, its growth rate is about 4%

History
of world population
Young vs old populations

If more than 35% of a country's population
is under the age of 15, it is considered a young population

If more than 15% of a country's population
is over the age of 65, it is considered an old population
Life expectancy

The average number of years a person could
expect to live (if current mortality trends continue)

All Americans: 76.9

All Males: 74.1

All Females: 79.5
Demographic Transition

the shift from high to low levels of both
fertility and mortality

more info here
