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Drake Equation
N = R*x fp x ne x fℓ x fi x fc x L

N is the number of civilizations in our galaxy with which communication might be possible;
and

R* is the average rate of star formation per year in our galaxy

fp is the fraction of those stars that have planets

ne is the average number of planets that can potentially support life per star that has planets

fℓ is the fraction of the above that actually go on to develop life at some point

fi is the fraction of the above that actually go on to develop intelligent life

fc is the fraction of civilizations that develop a technology that releases detectable signs of their existence into space

L is the length of time such civilizations release detectable signals into space.