McDonald's introduced the Quarter Pounder in the United States in 1971.
The burger was created by Al Bernardin, a McDonald's product-development executive who wanted to offer a larger hamburger than the chain's standard options. Its name referred to the quarter-pound weight of the beef patty before cooking, making the product's defining feature immediately understandable in advertising and on menus.
The Quarter Pounder became an important part of McDonald's product branding because its name communicated a precise size rather than a character, slogan, or place name. It also helped the company compete for customers seeking a more substantial hamburger.
The product is not called a Quarter Pounder in every country. In markets using the metric system, McDonald's commonly uses the name “Hamburger Royale” or another local equivalent. This is why international descriptions of the same sandwich can differ even when the core product is similar.