bracket

First, drag and drop any team(s) as far in the tournament as you want. When you're done, just hit the "Generate" button, and Slack Bracket will fill the rest of the bracket out for you in a statistically accurate way. You can hit the button as many times as you want.

Slack Bracket uses the NCAA March Madness Tournament data provided by FiveThirtyEight to create a relative strength rating for each team. When any two teams play each other, Slack Bracket looks at the rating for each team. It uses those ratings to find the percentage chance of each team winning the matchup. Then, using those percentages, it randomly picks a winner to advance (e.g. a team with a calculated 30% chance of winning will advance 30% of the time). This means that Slack Bracket will generate a statistically accurate number of upsets at each level of probability.