Keno Odds Calculator

In Keno, 20 numbers are drawn from a pool of 80. Players select 1-20 spots (numbers) before the draw. Payouts depend on how many of your selected spots match the 20 drawn numbers. The game runs continuously, with new draws every few minutes in most casinos.

Keno probabilities use hypergeometric distribution: C(spots, matches) × C(80 - spots, 20 - matches) / C(80, 20). The odds of matching all numbers increase dramatically with more spots. Hitting 20/20 is approximately 1 in 3.5 quintillion. Most payouts begin at matching 3-5 numbers.

Mathematically, 4-8 spot games tend to offer the lowest house edge (often 20-30%). Picking more spots increases variance enormously but reduces expected return. Single-spot keno often has the best return percentage (around 75%), while 15-20 spot games can have a house edge exceeding 35-40%.

Live lounge keno typically carries a house edge of 20-35%, among the highest in the casino; video keno paytables like the built-in ones here run closer to 5-10%, which is why this page reads a few percent on its Standard table. For comparison: blackjack is 0.5-2%, craps 1.4%, roulette 2.7-5.3%, slots 2-15%. The built-in tables are modelled, not a specific casino's: enter your casino's paytable in the custom fields to get its real edge. Keno's appeal is the lottery-like jackpot potential from small wagers, not its expected return.