Abstract: A foundation forming tool is comprised of an upper base and a lower base wherein the upper base is for resting upon the opposing planks comprising a foundation form well, and the lower base extends below the upper base, into the form well, for purposes of precisely and consistently defining the form well's width. The lower base can be made in 6, 8 or 10 inches in length, to conform to standard widths of foundation form wells. Additionally, this forming tool can be made to be telescoping and adjustable between these standard widths, so that one tool could accommodate a variety of forming needs. Finally, this forming tool further comprises a leveling apparatus for allowing a precise horizontal and vertical level to be achieved across a foundation form.