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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 good starter mattress for young adults or recent grads living on their own for the first time, the full mattress is 54 inches wide and 75 inches long. Sometimes called a double, the full is 16 inches wider than a twin, but is not recommended for couples who like to share the bed with pets or their children.