There are about 9.2 quintillion possible NCAA men’s March Madness brackets for a standard 64‑team field.

Quick Scoop

The core idea

Once the First Four play-in games are done, you effectively have a 64‑team bracket with 63 games. Each game has 2 possible outcomes (Team A or Team B wins). So the total number of possible brackets is:

  • 2632^{63}263 different ways to pick winners for every game (no ties, just win/lose per game).
  • 263≈9.22×10182^{63}\approx 9.22\times 10^{18}263≈9.22×1018, which is usually rounded as “9.2 quintillion” possible brackets.

That enormous number is why you often see stats like “you have a 1 in 9.2 quintillion chance of getting a perfect bracket” if every game were a pure coin flip.

Mini breakdown

  • Number of games in the main 64‑team bracket: 63.
  • Possible outcomes per game: 2 (one team advances).
  • Total possible brackets: 263≈9,223,372,036,854,775,8082^{63}\approx 9,223,372,036,854,775,808263≈9,223,372,036,854,775,808 ≈ 9.2 quintillion.

A quick thought experiment

Even if you could fill out 1 million different brackets every single second, it would still take hundreds of thousands of years to cover all 9.2 quintillion possibilities.

TL;DR: For a normal 64‑team March Madness setup, there are about 9.2 quintillion possible NCAA brackets, coming from 2632^{63}263 different ways the 63 games can play out.

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