# Fermi Problem

Category

Mathematics

Also Known As...

Back-of-the-Envelope CalculationBallparkGuesstimationRelated

Drake EquationFermi Paradox# Definition

A rough calculation to arrive at a reasonable estimate — unknowns and all — where the result could be considered logically approximate.

# Origin

Named for physicist Enrico Fermi's ability to make good approximate calculations with little or no actual data.