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The Drake Equation Calculator
By ClassBrain staff
Aug 24, 2006, 21:04 PST

R - Rate of formation of suitable stars in our galaxy (aggregate number)

R =

fp - Percentage of those stars with planets

fp =

Ne -Number of planets per star that could sustain life like earth

Ne =

fl - Percentage of those planets where life actually develops

fl =

fi - Percentage of planets from fl with intelligent life

fi =

fc - Percentage of planets from fi where technology develops

fc =

L - "Lifetime" of communicating civilizations (years)

L =

R * fp * Ne * fl * fi * fc * L = N



N - Number of communicative civilizations

N =

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