Kristian Ferrell
Every year, millions of basketball fans fill out brackets for the NCAA Tournament, also known as March Madness, which sees 68 teams facing off until only one champion remains. However, despite many fans' deep knowledge of the sport, no perfect bracket has ever been recorded. The odds of filling out a perfect bracket are estimated to be 1 in 9,223,372,036,854,775,808, or 1 in 120.2 billion if the person has basketball knowledge. To put this into perspective, if every person in the United States filled out a unique bracket that was 66.7% accurate, we would expect to see a perfect bracket in 366 years.
| Characteristics | Values |
|---|---|
| Odds of a perfect bracket | 1 in 9,223,372,036,854,775,808 |
| Odds in numerical format | 9.2 quintillion |
| Odds in comparison | 23% less than the chance of picking one of the 7.5 quintillion grains of sand on the planet |
| Odds in comparison to coin flips | 70 million times better than if every game was a coin flip |
| Number of games to predict | 63 or 64 |
| Number of teams | 68 |
| Number of brackets submitted in 2025 | 34 million |
| Number of perfect brackets submitted in 2025 | 2 |
| Chances of success compared to finding an acorn hidden in one of three trillion trees | Three million times greater chance of finding the acorn |
| Probability of generating the perfect bracket based on a model using basketball knowledge | 9,007,199,254,740,992 different brackets |
| Closest number of games predicted correctly | 49 out of 63 games in 2019 |
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What You'll Learn
The odds of a perfect bracket are 1 in 9.2 quintillion
The odds of filling out a perfect NCAA bracket are extremely slim, at about 1 in 9,223,372,036,854,775,808, or 1 in 9.2 quintillion. This figure represents an ideal scenario with a 50% chance of guessing every game correctly, and the actual odds of achieving a perfect bracket are likely even smaller.
To put this number into perspective, if you were to start filling out random brackets and stack each piece of paper on top of the other, the stack would reach the sun and back over 3,000 times. Even if every person on the planet joined in, it would take more than 2,500 years to fill out all the brackets. These odds are also 23% lower than the chance of randomly picking one specific grain of sand on the planet, which further emphasizes the sheer improbability of predicting a perfect bracket.
The challenge lies in the vast number of variables and potential outcomes in the NCAA basketball tournament. With 68 teams facing off in a series of matchups, the number of possible brackets is astronomical. While it is technically possible to achieve a perfect bracket, the odds are so overwhelming that it is highly unlikely to occur.
However, it's important to note that these odds can be improved by incorporating knowledge of the sport, the tournament's history, and an understanding of the current teams. While it may not be possible to quantify this knowledge accurately, it can increase the chances of predicting a perfect bracket. For example, before UMBC's historic upset of Virginia in 2018, it was almost guaranteed that all four No. 1 seeds would win their matchups, providing four automatically correct predictions.
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It's possible to increase your odds with more knowledge
The odds of filling out a perfect NCAA bracket are about 1 in 9,223,372,036,854,775,808, or 9.2 quintillion. To put this into perspective, if you were to begin filling out random brackets now and stacked each of the 9 quintillion pieces of paper on top of each other, the stack would reach to the sun and back over 3,000 times by the time you finished.
While these odds are indeed daunting, it is possible to increase your chances with more knowledge. For instance, before UMBC’s historic upset of Virginia in 2018, it was practically a guarantee that all four No. 1 seeds would win their matchups, giving you four automatically correct games to start off with. This type of knowledge is difficult to quantify or factor into an equation, but it can still give you an edge.
Albert Cohen, for example, suggests looking at historical matchups when making choices. He compares it to pro sports teams having scout teams to simulate opponents. By finding proxy teams for the two teams that haven't met, you can gain insight into how they might fare against each other.
Mark Ablowitz, an applied mathematics professor at the University of Colorado, Boulder, offers another strategy. He suggests asking yourself, "How many games out of the 63 are you willing to say, 'I will have a 100% chance of winning?''' If all the No. 1 seeds were guaranteed to win their first-round games, and every other game were chosen at random, the probability of a perfect bracket would improve to 1 in 576 quadrillion compared to 9.2 quintillion.
Additionally, Chartier, who leads a group of student researchers testing mathematical methods for picking teams in March Madness, recommends weighting the teams based on variables other than their regular-season records. He suggests considering factors such as when the games were played, the challenge of opponents, and the number of points each game was won or lost by.
While these strategies may improve your odds, it's important to remember that the probability of a perfect bracket is still extremely low. Even with advanced knowledge and strategies, it's a challenging task that may take over 1,000 years to achieve.
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The closest anyone got was predicting 49 games in 2019
The odds of filling out a perfect NCAA bracket are slim, to say the least. Estimates put the odds at around 1 in 9.2 quintillion, or 1 in 120.2 billion if every game were a coin flip. To put that into perspective, you'd have a greater chance of finding a single acorn hidden in one of the three trillion trees on Earth.
Despite these overwhelming odds, millions of sports fans take part in creating their own bracket predictions each year. While it's technically possible to predict a perfect bracket, the sheer number of variables and potential outcomes makes it incredibly challenging. The closest anyone has come was in 2019, when someone predicted the outcomes of 49 games correctly.
To improve your odds, it's essential to have knowledge of the current teams, the tournament's history, and an understanding of the sport. For instance, in 2018, it was almost guaranteed that all four No. 1 seeds would win their matchups, giving you four automatically correct predictions. However, upsets and unpredictable outcomes are common, making it extremely difficult to accurately predict every game.
Statisticians and sports analysts have developed models and algorithms to enhance prediction accuracy. Georgia Tech professor Joel Sokol, for example, has worked on a statistical model that predicts college basketball games with 75% accuracy. While this improves the odds significantly, it still falls short of a perfect bracket.
The odds of a perfect bracket are so slim that it's unlikely to occur in anyone's lifetime. Even with millions of people filling out brackets each year, the vast majority of possible bracket permutations remain unexplored.
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It's like flipping 47 coins, not 63
The odds of filling out a perfect NCAA bracket are extremely slim, estimated at 1 in 9,223,372,036,854,775,808, or 9.2 quintillion. This figure represents the chances of correctly predicting the outcomes of 63 games in the tournament, with 63 teams losing and one team emerging as the ultimate winner.
However, it's important to understand that not all games carry the same probability. The top seeds, for instance, are much more likely to win than the lower seeds, and upsets are relatively uncommon. So, while the overall odds may be comparable to flipping 63 coins, the presence of favourites and underdogs in the tournament makes it more akin to flipping 47 coins.
To put this into perspective, consider the example of picking an acorn hidden in one of three trillion trees on the first guess. Your odds of success in this scenario are approximately three million times greater than picking a perfect bracket. The challenge is further compounded by the sheer number of variables and potential outcomes, making it incredibly difficult to devise the perfect bracket.
While it may be technically possible to achieve a perfect bracket, the odds are so overwhelming that it is highly unlikely to occur in anyone's lifetime. In fact, according to the NCAA, there has never been a verified perfect bracket, and the closest anyone has come was in 2019, when a participant predicted the outcomes of 49 out of 63 games.
Despite the daunting odds, there are strategies and statistical tips that can improve your chances. For instance, historical matchups, passing networks, and understanding the centrality of certain teams can provide valuable insights. Additionally, factors like home-court advantage and the performance of individual players can also influence the outcome. By leveraging this knowledge and staying informed about the current teams and the tournament's history, you can make more educated guesses and increase your odds of success.
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No perfect bracket has ever been verified
While it is technically possible to create a perfect bracket, the odds of doing so are extremely slim. As of 2025, no perfect bracket has ever been verified. The NCAA has been tracking online submissions across platforms since 2016 and used archival data before that.
The odds of filling out a perfect NCAA bracket are about 1 in 9,223,372,036,854,775,808, or 9.2 quintillion. To put that into perspective, if you were to fill out random brackets and stack each piece of paper on top of each other, the stack would reach the sun and back over 3,000 times. Even if every person on the planet helped, it would take over 2,500 years to fill out 9 quintillion brackets.
The odds of a perfect bracket are so slim because there are so many variables and potential outcomes. There are 68 teams facing off in a series of matchups, and it is challenging to correctly predict the outcome of every game. While knowledge of the sport and its history can improve your odds, upsets occur every year, making it extremely difficult to predict every game correctly.
The closest anyone has come to a perfect bracket was in 2019, when Greg Nigl of Columbus, Ohio, correctly predicted the winner of the first 49 games, setting a new record and becoming the first person to carry a perfect bracket past the second round. However, his streak ended in the 50th contest.
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Frequently asked questions
The odds of filling out a perfect NCAA bracket are about 1 in 9,223,372,036,854,775,808, or 1 in 120.2 billion if the person has basketball knowledge. That's 9.2 quintillion, 23 percent less than the chance of picking one of the 7.5 quintillion grains of sand on the planet at random.
While there have been some close calls, there has never been a verified perfect bracket, according to the NCAA.
Your chances will increase with more knowledge of the current teams, the tournament's history, and an understanding of the sport itself.
Yes, there are several tools and models available online that can help you make more informed predictions for your bracket. For example, the BracketOdds website uses computer algorithms and past performances to determine the best picks.
