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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.
Mattress Dimensions. A Twin XL is the same width of a standard twin mattress, but adds 5-inches to the length. The overall dimensions of the mattress are 39 inches wide by 80 inches long. The additional length makes it unlikely to fit on an existing twin bed or frame.