This calculator allows you to predict the approximate number of alien civilizations in our own galaxy that we might be able to contact. Some default values are shown as a starting point but you can change these and enter your own numbers.
The number of stars that are born in the Milky Way each year.
The percentage of these stars that have solar systems of planets.
The average number of "Earthlike" planets (potentially suitable for life) in the typical solar system.
The percentage of those planets on which life actually forms.
The percentage of life-bearing planets where intelligence evolves.
The percentage of intelligent species that produce interstellar radio communications.
The average lifetime of a communicating civilization in years.
The number of civilizations we might be able to communicate with.