Free calculators and comparison tools built on real keno mathematics. No guesswork — exact probabilities from the hypergeometric formula.
Calculate the exact probability of hitting any number of matches from any spot count. See both "exactly k matches" and "k or more matches" with 1-in-X odds format.
Enter your bet size and spot count to see a full payout breakdown — expected value per match count, total RTP, and house edge. Compare multiple paytables side by side.
Side-by-side analysis of 4-spot, 6-spot, 8-spot, and 10-spot keno. Compare jackpot odds, winning probability, RTP, and variance. Includes an interactive spot picker slider.
All probability calculations use the hypergeometric distribution — the mathematically correct model for keno. We compute results in log-space to handle the extremely large numbers involved (C(80,20) exceeds 3.5 quadrillion) without floating-point errors.
Paytable data is sourced from publicly available lottery and casino information. Always verify current paytables with your state lottery or casino before playing.