Drake equation is Bayesian-derived probabilistic argument which is useful for us to realize how much we are a part in the universe. It was developed by Frank Drake in the year 1961. This Drake equation calculator is used to find the number of active and intelligent civilizations from earth in the Milky Way Galaxy. Enter the parameters inside the calculator and find the number of possible radio communication civilizations.
For a 400 billion of Formation of Suitable Stars, the fraction of those Stars with Planets is 30%. The Number of Earth-like Worlds per Planetary System is 3 and the Fraction of those Earth-like Planets is 20%. The Fraction of Life Sites is 30%, fraction of Communicative Planets is 10% and the Lifetime of Communicating Civilizations is 10,000,000 years, then according to drake equation, the number of communicating civilizations is
N = (400000000000 x (30/100) x 3 x (20/100) x (30/100) x (10/100) x 0.001)
N = 400000000000 x 0.3 x 3 x 0.2 x 0.3 x 0.1 x 0.001
N = 2160000