The Difference Between McDonald's Big Mac & Burger King's Whopper

McDonald's and Burger King need no introduction. Both sit comfortably at the top of the fast-food game, and they have their burgers to thank for their global icon status. Even if you've never set foot inside either chain, chances are you've heard of the Whopper and Big Mac before. They're very different sandwiches, but have spent decades going head to head. The, excuse the pun, beef between the two chains has long been fast food lore. So what better way to settle things than by taking a closer look at what actually sets these heavy hitters apart?

Some differences you'll spot just by looking at the burgers side by side, like the Big Mac's two patties to the Whopper's one, or the extra bun hanging out in the middle of the Big Mac. Others you'll taste. Burger King famously flame-grills its patties, which gives the Whopper a smoky char, while McDonald's cooks the Big Mac patties on a flat griddle for a different, more seared flavor. Then there are the differences that are less obvious, and they have as much to do with history and branding as with what's beneath the buns.

Start with age. McDonald's traces its origins to 1940, well before Burger King's founding in 1954, yet the Whopper is the older burger by a significant margin. Then there's how each chain treats its flagship. Burger King has used the slogan "Home of the Whopper" for decades, so there's no question which burger is its standout. At McDonald's, the answer is less clear. The Big Mac is, of course, nothing short of iconic, dare we say even more so than the Whopper. But that lineup also includes the Quarter Pounder and the cult-favorite Filet-O-Fish, so it has to share the spotlight.

The Big Mac is nearly a whole decade younger than the Whopper. Invented in 1967 by Jim Delligatti, a local franchisee in Uniontown, Pennsylvania, it was first launched nationwide in 1968. The burger was born out of a practical need, with its double patties designed to give steelworkers — frequent customers at Delligatti's restaurant — a more filling meal after completing their shifts. 

When it comes to the build, few burgers do things quite like the Big Mac. There are several things that set it apart from the Whopper. It features two beef patties, signature Big Mac sauce (frequently compared to Thousand Island dressing), shredded lettuce, American cheese, pickles, and onions. Already, there are some pretty glaring differences between the two — namely, they share just four ingredients: beef patties, lettuce, pickles, and onions. The Whopper also adds ingredients like tomatoes, ketchup, and mayonnaise. And if we're getting really nitpicky, even the onions are different; the Whopper uses sliced onions while the Big Mac opts for diced.

Obviously, there are two major differences we can't ignore. Firstly, there's the number of patties in each burger. The other is the number of buns. While the Whopper sticks to the standard two-bun setup, with everything wedged in the middle, the Big Mac uses three. The extra piece of bread, known as the club slice, isn't just there for show. Delligatti introduced the middle bun to help give the burger more structure, separating the two beef patties and making the towering stack easier to hold together. It also helps keep the sauce and other toppings from making the bottom bun too soggy under the weight of the fillings, giving the Big Mac its distinctive three-tiered construction.

Arriving a decade earlier than the Big Mac in 1957, the Whopper was created by the chain's co-founder Jim McLamore. It has since become Burger King's signature burger, spawning several variations over the years. These include the veggie-friendly Impossible Whopper, the barbecue-flavored Texas Whopper, and double- and triple-patty versions for those with a bigger appetite. At McDonald's, the Big Mac is something of a Lone Ranger, with no permanent variations on the classic burger offered on the standard U.S. menu.

Beyond their ingredients, another major difference between the Whopper and Big Mac is how the beef patties are cooked. McDonald's cooks its patties on a clamshell griddle before holding them in heated cabinets. Burger King, meanwhile, is famous for its flame-broiling method. Its frozen beef patties travel along a metal conveyor belt through a broiler, where open flames cook the meat. Many have argued that this smoky edge is what puts the Whopper ahead of the Big Mac in terms of taste. Plus, the Whopper claims to contain a quarter pound of beef, which beats out the Big Mac.

Both burgers also have slightly different nutritional profiles. If protein is what you're after, the Whopper has the edge. Despite containing just one beef patty compared with the Big Mac's two, a standard U.S. Whopper contains more beef by weight. That difference is reflected in their respective nutritional figures: A Whopper contains around 34 grams of protein, compared with approximately 25 grams in a Big Mac. This number further pales in comparison to the Triple Whopper, which contains a staggering 78 grams of protein, putting it comfortably in the ranks of the fast food burgers with the most protein.