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ABSTRACT Flow rates of wheat, corn, sorghum, and soybeans through horizontal and vertical orifices were measured. Orifice sizes ranged ft-om 100 to 400 cm2 with each size consisting of six different shaped orifices. The observed relationships between volume flow rate per unit orifice area and orifice hydraulic diameter for both horizontal and vertical orifices were log-linear for all grains. Coefficients for an empirical equation to predict volume flow rate of grain through various sizes and shapes of horizontal and vertical openings were determined and presented. For the same hydraulic diameter, differences in flow rate per unit orifice area were significant among the six different orifice shapes, and the interaction of orifice shape and hydraulic diameter was also significant for all grain and for both vertical and horizontal orifices. Volume fiow rate per unit orifice area increased as the orifice hydraulic diameter increased for all grains. Volume flow rate of grain through vertical orifices was about 37 to 50% of the flow rate through the same orifices placed horizontally.