Estimate the number of technological civilizations in our galaxy.
Drake Equation Parameters
Civilization Estimates
Enter parameters to calculate
About this calculator
Quick Reference
R*Rate of star formation
fpFraction with planets
neHabitable planets per star
flFraction that develops life
fiFraction that develops intelligence
fcFraction that is communicative
LLifespan of civilization
Overview
The Drake Equation is a probabilistic argument used to estimate the number of active, communicative extraterrestrial civilizations in the Milky Way galaxy. It was first proposed by Frank Drake in 1961.
💡
Pro Tips
The equation is intended as a framework for discussion rather than a precise prediction.
L (lifespan) is often considered the most uncertain factor.
Most parameters are between 0 and 1, except for star formation rate and years.
!
Fun Facts
"Frank Drake used the equation for the first time at the first SETI meeting."
"Optimistic estimates suggest thousands of civilizations, while pessimistic ones imply we are alone."
"The Fermi Paradox asks: 'If there are so many civilizations, where is everybody?'"
