An apparatus (10) and method for metering and treating seed. The apparatus (10) incorporates a belt conveyor (16) or circular conveyor (16a) within a housing (12) enabling a low-profile configuration, the conveyor (16) having a plurality of cleats (28) forming a series of separate voids for transporting determinable volumes of seed, and a seed treatment applicator (34) adjacent the conveyor (16) outlet (26) for applying seed treatment to the seed. The apparatus (10) and method allows for the application of seed treatment based on a mass flow calculation derived from the measured volume flow through the apparatus (10).