There are 2632^{63}263 possible standard March Madness brackets, which is 9,223,372,036,854,775,808 different ways to fill out a 64‑team bracket.

How Many Possible March Madness Brackets Are There?

Quick Scoop

For a typical NCAA men’s March Madness bracket (ignoring the “First Four” play‑in games), you start picking winners once the field is down to 64 teams. From that point:

  • The tournament is single elimination.
  • There are 63 games total (32 + 16 + 8 + 4 + 2 + 1).
  • Each game has 2 possible outcomes.

So the number of possible brackets is:

263=9,223,372,036,854,775,8082^{63}=9,223,372,036,854,775,808263=9,223,372,036,854,775,808

That’s about 9.2 quintillion possible brackets.

Why 63 Games?

Once the “First Four” is done, you have:

  1. 64 teams in the main bracket.
  1. In a single‑elimination tournament, every game removes one team.
  2. To go from 64 teams down to 1 champion, 63 teams must lose, so there must be 63 games.

Each of those 63 games can go one of two ways (Team A wins or Team B wins), so you multiply 2 by itself 63 times.

How Big Is 9.2 Quintillion?

To give a feel for how huge that is:

  • If every person on Earth filled out a completely unique bracket, we would still cover only a tiny fraction of all possible brackets.
  • Even with tens of millions of brackets submitted online every year, we barely scratch the surface of the total combinations.

That sheer size is why no one has ever verified a truly perfect bracket across all games.

Small Twist: Accounting For Seeds

Some mathematicians refine the estimate by assuming higher‑seeded teams are more likely to win instead of treating every game as a 50–50 coin flip. When you add in those real‑world tendencies:

  • The raw count of possible brackets is still 2632^{63}263.
  • But the odds of someone actually picking a perfect one improve from “1 in 9.2 quintillion” to something like 1 in hundreds of quadrillions or even “just” trillions, depending on the model.

It’s still astronomically unlikely for anyone to hit perfection in a given year.

Fast FAQ Style Recap

  • Question: How many possible March Madness brackets are there (64‑team, standard pools)?
    Answer: 263=9,223,372,036,854,775,8082^{63}=9,223,372,036,854,775,808263=9,223,372,036,854,775,808 possible brackets.
  • Question: Does this include the “First Four”?
    Answer: Most pools ignore those games; the classic 9.2‑quintillion figure starts at 64 teams.
  • Question: Has anyone ever hit a perfect bracket?
    Answer: No verifiable perfect bracket has ever been recorded; the best known streak got the first 49 games right.

Bottom note: Information gathered from public forums or data available on the internet and portrayed here.