Tracking How Many Perfect Brackets Remain in 2025 March Madness NCAA Men's Tournament

From inventing the wheel to harnessing electricity to going to the moon, human beings have a long history of overcoming the odds and accomplishing things that were once deemed impossible.

But one thing remains an impossible task.

Filling out a perfect bracket.

You may win your office pool and impress with a number of picks during the NCAA men's basketball tournament, but you're not going to finish with an undefeated record. According to Daniel Wilco of NCAA.com, "No one has gotten a verifiably perfect bracket in the history of the NCAA tournament."

So how many perfect brackets remain in this year's men's tournament bracket game on NCAA.com?

That number will continue to dwindle as the Big Dance continues until it inevitably hits zero. 

And how could it not? 

All it takes is one major upset to dramatically decrease the number of perfect brackets. Surely there weren't many people who predicted 16th-seeded UMBC to defeat top-seeded Virginia or 16th-seeded Fairleigh Dickinson to defeat top-seeded Purdue in previous years.

Even those who do correctly predict those seismic upsets will have to guess every single upset correctly while also nailing their selections for the Sweet 16 and beyond to continue with a perfect bracket.

That's just not going to happen throughout the entire tournament.

Rafael Avitabile of San Diego State University broke down the odds of filling out a bracket and noted they are one in "147.5 quintillion, or nearly 20 times the number of grains of sand on Earth" if one assumes every game is a 50/50 chance.

While the seeding in the tournament makes it so every game actually isn't a 50/50 chance outcome, it still illustrates just how enormous the odds are for everyone participating in March Madness pools.

Just making it out of the first day with an undefeated record would be quite the accomplishment, but it's not going to stop people from dreaming of the impossible again the same time next year.