The NBA draft lottery is a weighted random drawing that determines the order of the first few picks in the draft among teams that did not make the playoffs, giving worse-performing teams better odds while stopping any single team from being guaranteed the top selection. It is the league’s answer to a tricky problem: how to help struggling teams add young talent without rewarding them for deliberately losing games. The lottery keeps the worst teams likely to pick high, but never certain to.
Why a lottery exists at all
In a straight reverse-order system, the team with the worst record would automatically receive the first pick. That sounds fair, but it creates a perverse incentive: a team out of playoff contention has a reason to lose on purpose to secure the top selection, a practice known as tanking. The lottery is designed to blunt that incentive. Because the top pick is decided by chance rather than guaranteed, being the worst team improves your odds but does not lock in the prize.
Who is in the lottery
The lottery includes the teams that failed to qualify for the playoffs. Each of those teams is assigned a set of odds based on its regular-season record. Broadly, the worse a team’s record, the better its chances of landing a high pick. The teams that reached the playoffs are not part of the draw; their draft positions are set later, in reverse order of how far they advanced and their records.
How the odds are weighted and flattened
The heart of the system is a weighted odds table. Better odds go to teams with worse records, so a team near the bottom of the standings has a far greater chance at the number-one pick than a team that just missed the playoffs. However, the NBA deliberately “flattens” the very top of that table. Rather than giving the single worst team a clearly dominant chance, the league assigns the same leading odds to the three worst teams.
This flattening is intentional. By making several bad teams share the best chance, the reward for being the absolute worst is reduced, which further discourages tanking. A terrible record still helps, but it no longer stands alone at the front of the line.
The ping-pong balls
The mechanics of the draw use numbered ping-pong balls in a machine, similar to a state lottery. A set of balls is placed in the drum, and a group of them is drawn to form a combination. Before the draw, every possible combination is assigned to the lottery teams in proportion to their odds, so a team with better odds holds more combinations. When a combination is drawn, whichever team owns it wins that pick. The process repeats to fill the top lottery slots, ignoring any repeat or invalid combinations.
Because the assignment of combinations is done in advance and in public view, the system is transparent. No team can influence which balls come out of the machine, and the proportional split of combinations is the only place where a team’s record has any effect. From the moment the balls start dropping, it is pure chance operating within those pre-set weights. This blend of fixed odds and random selection is what gives the lottery both fairness and unpredictability.
What the lottery actually decides
It is important to understand that the lottery only sets the order of the first handful of picks, not the whole draft. Once those top selections are drawn, the rest of the first round is filled in reverse order of regular-season record among the non-playoff teams, followed by the playoff teams. So a team can enter the lottery with strong odds, miss on the drawn combinations, and still land close to where its record would have placed it anyway.
Why the details matter
For rebuilding franchises, the lottery is one of the most consequential nights of the year, because a single high pick can reshape a roster for years. But it is fundamentally a game of weighted chance, not a guarantee. Understanding the flattened odds and the combination draw explains why the worst team does not always pick first, and why a team a few spots up the standings can occasionally jump ahead. If you are learning how the pro game is built and played, it pairs well with understanding on-court basics like the pick and roll and how officials enforce conduct through a technical foul.
Frequently asked questions
Why does the NBA use a lottery instead of just reverse order?
To reduce the incentive for teams to lose games on purpose. If the worst record guaranteed the top pick, struggling teams would have reason to tank. A weighted random draw keeps the worst teams likely to pick high without making a bad record a guarantee.
Do the worst teams have the best odds?
They share the best odds. The league flattens the top of the odds table so the three worst teams hold the same leading chance at the number-one pick, rather than one team standing clearly above the rest.
How many teams are in the lottery?
The teams that did not qualify for the playoffs. Their regular-season records determine each team’s weighted chances, with worse records generally receiving better odds.
How are the winners actually drawn?
The NBA uses a set of numbered ping-pong balls in a machine. Balls are drawn to form a combination, and each combination is pre-assigned to a team. The team holding the drawn combination wins that pick.
Does the lottery decide the entire first round?
No. It only sets the order of the top few selections. After those are drawn, the remaining first-round picks are slotted in reverse order of regular-season record.
