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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.
+. The full size mattress, also known as a double mattress, is approximately 16 inches wider than a twin mattress, but does not provide enough added room for two people to sleep comfortably. It may be too short for adults taller than 5â5â. Full beds are 54 inches wide by 74 inches tall.A full size mattress is a great choice for growing children, plus the added space allows for parents to lie down while tucking their kids in for the night.ull beds are 54 inches wide by 74 inches tall. A full size mattress is a great choice for growing children, plus the added space allows for parents to lie down while tucking their kids in for the night.