A standard queen-size mattress measures 60 inches in width and 80 inches in length. The surface idea of a queen-size mattress is about 4,800 square inches. However, a standard full-size mattress measures 53 inches in width and 75 inches in length. Its surface area is about 3,975 square inches. Hence, a full mattress is 7 inches narrower and 5 inches shorter than a queen-size mattress.