Powerball methodology

Equal odds, different choices

Powerball has 292,201,338 valid jackpot combinations under the current rules: choose five of 69 main numbers, then one of 26 Powerballs. Every valid combination has the same jackpot probability. Our analysis does not change it.

One jackpot, two countries

Since the draw of 22 July 2026, Powerball lines bought in the United Kingdom through The National Lottery play for the same jackpot as US lines, so a jackpot is shared between every winning line in both countries. Lower prizes stay separate: the official US winner counts that Wisenum’s model learns from cover US lines only, while UK lower prizes are paid from UK sales. The National Lottery publishes UK winners per tier for every draw, and Wisenum reads them too: UK lines are a small share of each draw and UK players pick numbers the way US players do (figures below), so the ranking Wisenum gives a line holds for both countries.

Over 32 draws since Jul 22, 2026, UK lines were on average 4.8% of the lines playing for the jackpot (range 1.9%–7.6%), estimated from official lower-tier winner counts on both sides. Draw by draw, the UK and US rates of three-number winners correlate at r = 0.96. The popularity model is trained on US winner counts. This small sample does not establish that UK players choose numbers the same way, so UK estimates carry that extra uncertainty.

Generation and indicators

The free builder uses cryptographic random integers with rejection sampling. Main numbers are selected without replacement after preserving your chosen numbers. Above-31 count, odd/even split, sum, span and adjacent consecutive pairs are calculated directly from the line. No prediction model is used.

Historical data and scope

Draw records come from the New York State Gaming Commission dataset. We retain draws from October 7, 2015 onward to avoid mixing incompatible number ranges. The results page shows the import timestamp and links to the source. A scheduled import validates records before publishing them.

Historical replay

Analyze compares your line with every draw under the current rules. It reports all prize-tier matches, the number of non-matching draws, and what random lines got over the same draws. It is retrospective: the line was not necessarily generated before those draws. Monetary prizes are not calculated, because rules and payouts can vary.

What Wisenum measures

Many players pick their numbers the same way: birthdays, sequences, patterns on the play slip. When those numbers come up, the jackpot and prizes are shared between more winners. Wisenum estimates how closely a line resembles these common choices — its “popularity” — from the official results published after every draw, and suggests lines that resemble them less.

Wisenum also takes the popularity of the Powerball into account when you let it choose them.

What the results show

Over the last 200 draws (since Jun 25, 2025), when the numbers drawn were among those Wisenum rates as the most played, there were on average 26% more winners for the same number of players than when they were among the least played.

95% bootstrap interval: 22% to 31%, comparing the 50 draws rated most played with the 50 rated least played. It describes past draws, not a forecast.

The estimate is updated every quarter with the new official results: it currently covers draws up to Sep 19, 2026.

Before a model is used, it is checked against official results it was not built from. Readings from a model that has not passed are never presented as validated.

What it cannot measure

Official results do not say how many people played exactly your line. Popularity is an estimate of general tendencies, not a promise of a prize or of being a sole winner.