Round and Square Pans 6-inch round: about 12 ounces batter. 8-inch round: about 24 ounces batter. 8-inch square: about 28 ounces batter. 9-inch round: about 28 ounces batter. 10-inch round: about 35 ounces batter. 2-inch cupcake: about 1 3/4 ounces batter.