Keno Explained: How the Game Works, the Real Odds and Why Number Picking Can't Beat the House Edge
Keno looks like the simplest game in the casino: pick some numbers, watch twenty balls get drawn, and see how many of yours came up. It is also one of the games with the highest built-in cost to the player. This guide covers how a ticket works, what your chances really look like, and why there is no pick-your-numbers strategy that changes them.
How a Keno Ticket Works
A keno board has 80 numbers. You mark between one and ten of them, which are called spots, and choose how much to wager. The game then draws 20 numbers at random. Your payout depends on how many of your spots were among the 20 drawn, and it is read off a pay table printed on the ticket or shown on screen. In a casino keno lounge you fill in a paper ticket and hand it to a runner or writer. Video keno on a slot-style machine works the same way but lets you play many games per hour.
What Your Chances Actually Look Like
The math is fixed by the layout. Because 20 of 80 numbers are drawn, any single number has a 25 percent chance of appearing. Pick two spots and the chance of catching both is about 6 percent, roughly one in 17. Pick four and hitting all four is about one in 326. Pick ten and matching all ten is about one in 8.9 million. Pay tables reward these long shots, but never by as much as the odds would justify, and that gap is where the casino's edge comes from.
The House Edge Is Large and Varies by Pay Table
Unlike blackjack or craps, keno has no single house edge. Each casino prints its own pay table, and the edge usually lands somewhere in the range of 25 to 40 percent on traditional keno, with some video versions noticeably lower. That is several times the cost of most table games, which is why our overview of house edge by game puts keno near the bottom of the value ranking. Exact figures differ by property and machine, so treat any number as a ballpark and read the pay table in front of you.
Does Picking Numbers Strategically Help?
No. Every draw is independent, and the 20 numbers are chosen without regard to earlier results. "Hot" and "cold" numbers, patterns on the board, birthdays and lucky sequences all have exactly the same chance as any other set of the same size. The only decisions that matter are how many spots you mark and how much you bet. Those change how often you win and how large the swings are, but they do not lower the casino's edge.
Choosing How Many Spots to Play
Marking only a few spots means you win small amounts more often. Marking eight, nine or ten means long dry stretches broken by rare large payouts. Neither is more favorable; they are different levels of volatility. If you want a longer session on a fixed budget, fewer spots and smaller tickets tend to stretch it. Chasing the top prize on a ten-spot is closer to buying a lottery ticket than to playing a table game.
Way Tickets, Combinations and Multi-Race Play
Traditional keno lounges offer ways to group numbers into several smaller tickets on one card, and many let you repeat the same ticket over multiple games. These options change how your money is spread, not the underlying odds. Each smaller ticket carries the same edge as any other ticket of its size, so combining them does not buy a better bet. Check that you understand the total amount you are wagering before you hand the ticket in, because it is easy to overspend on a multi-game card.
Practical Tips for the Keno Lounge
Read the pay table before marking anything, since two tickets of the same size can pay differently from one casino to the next. Set a budget before you start and stop when it is gone. Check your ticket promptly after each game and confirm how long winning tickets stay valid, because the claim window is set by the casino. If you enjoy number games on a modest budget, keno can be a relaxed pastime, but it is poor value for anyone trying to stretch their money. For games where correct decisions really do lower the edge, look at video poker or the low-edge craps bets.
For more game guides, see all of our casino game guides.
General information only; pay tables, odds and house edge vary by casino and machine, so confirm the rules where you play. 21+ in the United States, 18+ in the United Kingdom. Gambling is entertainment with a built-in cost, not a way to make money. See our responsible gambling page if it stops feeling like fun.
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