Drake Equation Calculator
R * F
p
* N
e
* F
l
* F
i
* F
c
* L = N
R
=
Rate
of formation of suitable stars in our galaxy (number per year)
F
p
=
%
Fraction (percentage) of those stars with
planets
N
e
=
Number of
"earths"
per planetary system
F
l
=
%
Fraction (percentage) of those planets where
life
develops
F
i
=
%
Fraction (percentage) of sites with
intelligent
life
F
c
=
%
Fraction (percentage) of planets where
technology
develops
L
=
"Lifetime"
of communicating civilizations (years)
N
=
1
Number of communicative civilizations
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