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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 double bed is the same as a full size bed and is about 74 inches by 53 inches according to these best rated double / full bed mattresses: http://www.amazon.com/s/ref=sr_nr_n_2?fs... So that's how big a double bed is. Just for comparison, a queen size bed is about 80 by 60 so roughly 6 inches longer and 7 inches wider so not too much of a big difference but for some people, it's just enough to feel like they have plenty of room.