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The Quarter Pounder is a brand of hamburger introduced in 1971 by a Fremont, California franchisee of international fast food chain McDonald's and extended nationwide in 1973. Its name refers to the beef patty having a precooked weight of approximately one quarter of a pound, originally portioned as four ounces (113.4 g) but increased to 4.25 oz (120.5 g) in 2015.[2] In some countries where the pound is not customarily used as a unit of weight, the hamburger's branding instead features the word Royal.

In 2013, the Quarter Pounder was expanded to represent a whole line of hamburgers that replaced the company's Angus hamburger, which was discontinued due to high prices for Angus Beef at the time.