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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.
edit Non-Standard Dimensions. Both full and twin beds have extra-long, or XL, versions, which add an extra five inches (13 cm) to the bed's length. At 80 inches (203 cm), this makes these versions of full and twin size beds as long as king and queen size beds.