One mixed gallon of TotalBoat Fathom Deep Pour Epoxy will cover approximately 0.8 sq ft at a 2" depth. 

The maximum recommended pour depth is 2" for larger slab pours. 

Given that 1 cubic foot equals 7.48 U.S. gallons, this indicates how far one gallon can be expected to go.

A 1.5-gallon kit will cover approximately 1.2 sq ft at a 2" depth, and a 3-gallon kit will cover approximately 2.4 sq ft at a 2" depth.

Note: Fathom should not be poured at less than 1" thickness, as extended cure times will result.