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Quick Answer. A double size bed, commonly referred to as full size, measures 54 inches wide by 75 inches long. The height varies from as little as 4 inches to over 17 inches, depending on manufacturer and construction. Continue Reading.
Single/Twin bed â Single beds and twin beds are the same type of bed, designed for one person. The average dimensions for this size of mattress are seventy-five inches by thirty-nine inches. Because these beds are narrow, they can easily fit into even the smallest bedrooms.