Estimate the number of bushels in a round grain bin. Calculation includes the volume of the bin in cubic feet and litres. The United States uses the Winchester bushel (1.244456 ft²), and in Canada, they use the Avery bushel ( 1.284349 ft²).
V = Π (D/2)²H; where V is the volume of the bin Π = 3.14159 D = the diameter of the bin H = the height of the bin
one bushel (bu) US = 1.24445601851852 cubic feet (ft³) one bushel (bu) Imperial = 1.28434922588714 cubic feet (ft³) one cubic foot (ft³) = 28.316846592 litres (L)