Understanding the NBA Draft Lottery Rules and Odds

The NBA draft lottery decides which of the 14 teams that missed the playoffs get the top four picks. This system is meant to help struggling teams and prevent them from losing games on purpose.

The current system was created to stop teams from losing on purpose to get the top pick. Now, the odds are based on regular-season standings, and the three worst teams each have the same highest chance at the first pick. This recent change is meant to discourage "tanking."

Understanding how the lottery works and how teams are picked helps explain how NBA teams build their rosters for the future.

The Mathematical Foundation of the Lottery

The lottery uses 14 ping-pong balls, each with a number. Four balls are picked at random to decide the results.

There are 1,001 possible combinations of four balls, no matter the order. Before the lottery, the league gives 1,000 of these combinations to the 14 teams, with more going to teams that finished lower. One combination is left out and ignored if it comes up.

The machine draws four balls to decide the first pick, and the team with that combination wins. This is repeated for the next three picks. If the same team comes up again, a new combination is drawn instead.

Establishing the Drafting Order

Only the top four picks are decided by the lottery. After those are set, the rest of the picks (5 through 14) are given out based on regular-season records. The team with the fewest wins among the remaining teams picks fifth, and the order continues from there.

This system ensures that the worst teams still get high draft picks, even if they do not finish in the top four. It balances the need for rebuilding with some randomness.

Percentage Odds Breakdown

Since the lottery rules changed in 2019, the chances for each team to get the top pick are:

• Worst Team: 14.0%

• 2nd Worst Team: 14.0%

• 3rd Worst Team: 14.0%

• 4th Worst Team: 12.5%

• 5th Worst Team: 10.5%

• 6th Worst Team: 9.0%

• 7th Worst Team: 7.5%

• 8th Worst Team: 6.0%

• 9th Worst Team: 4.5%

• 10th Worst Team: 3.0%

• 11th Worst Team: 2.0%

• 12th Worst Team: 1.5%

• 13th Worst Team: 1.0%

• 14th Worst Team: 0.5%

You can see how the odds drop from team to team. For example, the worst team has a 14% chance, while the 8th-worst team only has 6%. Giving the bottom three teams the same odds is meant to stop teams from trying to finish last.

The Future Structure of Team Building

The lottery is a big event that can change a team's future. One drawing can bring in new talent and shift a team's direction. The national attention on the lottery shows how important the results are.

The NBA is still looking at how well these lottery rules keep the league balanced. The current system is a compromise. It tries to stop teams from losing on purpose by making the odds more even at the bottom, but it still gives the worst teams the best chances. In the end, the mix of strategy and luck in the lottery means every season brings new hope and some uncertainty for teams and fans.

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