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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-size bed is designed for one person. The main size difference between a twin bed and a full bed, also known as a double bed, is the width. A full bed offers more space from side to side, but certain twin beds are longer for taller users. A regular twin-size bed is 39 inches wide and 75 inches long, and is made to accommodate one adult or child.