"With the expansion of legal sports betting over the last year, both in terms of new markets and growth within existing markets, a historic weekend is inevitable," said Dustin Gouker, lead analyst for PlayUSA.com. "Half a billion dollars or more bet on one game seems almost unfathomable, but considering the direction of the U.S. market, that handle is easily within reach."

With 20 states and Washington D.C., representing a population of about 120 million, now offering some form of legal sports betting, a year-over-year jump is certain. Last year, 14 states, representing a population of 70 million, allowed for legal Super Bowl bets. Those 14 states combined for an estimated Super Bowl handle of $300 million, according to PlayUSA.

The Super Bowl is always the most bet-on single sporting event in the U.S. In 2020, the American Gaming Association estimated that $6.8 billion was bet, both legally and illegally.

For this year's game:

• Sports betting is legal in at least some form in Arkansas, Colorado, Delaware, Illinois, Indiana, Iowa, Michigan, Mississippi, Montana, Nevada, New Hampshire, New Jersey, New Mexico, New York, Oregon, Pennsylvania, Rhode Island, Tennessee, Virginia, Washington D.C., and West Virginia.


• Illinois, Colorado, and Tennessee did not offer any form of legal sports betting for last year's Super Bowl. Together they represent three of the seven largest legal sports betting markets currently operating in the U.S.


• Nevada, the second-largest market in the U.S., is expected to lead all U.S. markets with $125 million in bets on the big game, according to PlayUSA projections.

"The potential this year is enormous compared to last year, with legal sports betting available to 50 million more people than last year's Super Bowl," said Eric Ramsey, analyst for PlayUSA. "The U.S. market has changed so much over the last year. Not only has it nearly doubled in size, but bettors now make a higher percentage of their bets online compared with a year ago. And sportsbooks will utilize the Super Bowl to aggressively promote themselves to new customers, especially in fledgling markets like Michigan and Virginia."

The Mahomes-led Chiefs are consensus 3-point favorites over the Brady-led Bucs, with an over/under that could surpass the Super Bowl record of 57 points by kickoff. Prop bets and in-game wagering will also add significantly to the handle, especially as bettors have become more accustomed to betting via mobile apps.

"It's an intriguing matchup with two of the biggest names in the sport, Patrick Mahomes and Tom Brady, facing off, and that should help compensate for both teams being from relatively small markets," Gouker said. "With the expansion of the sports betting market, it is close to a certain win for the industry, with the potential to reach more customers than ever before."