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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.
Twin Bed. Twin beds are 39 inches wide and 75 inches long, so a standard twin headboard is 42 inches wide. The twin extended headboard size is also 42 inches because the difference between the two beds is in the length. A twin extended bed is 80 inches long. The full-size bed, also known as the double bed, is 59 inches wide, not quite double that of a twin bed. The length is 75 inches.