Crabs are graded by size, relative to points across the backs of their shells. Standards measure between 5 and 5½ inches across, with 7 dozen crabs per bushel. Selects measure between 5½ and 6 inches across, with 6 dozen crabs per bushel. Premiums measure 6 to 6¾ inches, with 5 dozen per bushel. Colossal crabs measure over 6¾ inches from point to point, and are only sold in dozen quantities. Jumbo female crabs measure 5¼ to 6 inches, with approximately 6 dozen per bushel. Small/medium female crabs measure 5¼ and smaller with no minimum size, and run approximately 7 dozen per bushel.