Drake Equation Calculator

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


R
=

rate at which stars form
fp
=
 
fraction of stars that have planetary systems
ne
=

number of planets, per planetary system, that are suitable for life
fl
=
 
fraction of planets suitable for life on which life actually arises
fi
=
 
fraction of life-bearing planets where intelligence develops
fc
=
 
fraction of planets with intelligent life that develop a technological
phase during which there is capability for and interest in interstellar
communication
L
=

average lifetime of communicable civilizations

N

=

1   

number of communicable civilizations in our galaxy

r

=

    

average distance to nearest civilization (ly)
(if N < or = 1, r has no meaning)

q

=

    

birthrate of technological civilizations
(our existence sets a lower limit of 2e-10)
     
   
         
clear all        








21 April 2009
Astronomy Program · The University of Texas at Austin · Austin, Texas 78712
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