Cake Sizes & Party Servings (3-layer cakes) • 5-inch → 6–8 servings • 6-inch → 10–14 servings • 7-inch → 14–18 servings • 8-inch → 18–22 servings • 9-inch → 22–26 servings • 10-inch → 26–32 servings • 11-inch → 34–40 servings • 12-inch → 40–48 servings