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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.
A twin bed offers a single sleeper 39 inches of sleeping space, but at only 74-75 inches long, it may be too short for some adult males. A full-size mattress (also called a double) is also best suited for a single person.