Keno Rules and Odds: How the Game Really Works
5 min read
Keno fits into two sentences. You pick a few numbers, then 20 out of 80 are drawn, and the more of yours come up, the bigger the payout. So the keno rules are not the hard part. The maths is the part worth your time, because keno carries one of the highest house edges of any game.
Keno rules: how a round works
- Pick your numbers. The card shows 1 to 80. Depending on the version you mark between 1 and 10 of them (some games allow more). Each number you pick is called a “spot”.
- Set your stake. The stake covers the whole round, not each number.
- The draw. Twenty of the 80 numbers are drawn at random, by a random number generator online or with numbered balls in lottery keno.
- Settlement. The game counts how many of your numbers are among the 20 drawn. The paytable states what each number of hits pays.
There are no decisions during a round. Your only inputs are how many numbers you pick and how much you stake.
How keno payouts work
Every spot count has its own paytable, listing a multiplier for each possible number of hits. With few spots you need nearly all of them to land, but something lands fairly often. With 10 spots, payouts commonly start at five hits, and the top prize for 10 out of 10 is correspondingly large.
Paytables differ a great deal between games. Two keno versions with identical rules can have very different returns, so it is always worth opening the game info before you play.
The odds of hitting your numbers
Any single number is drawn with a probability of 20/80, or 25%. Hitting every number you picked gets steeply harder with each extra spot:
| Numbers picked | Chance of hitting all |
|---|---|
| 1 | 1 in 4 |
| 2 | 1 in 16.6 |
| 3 | 1 in 72 |
| 4 | 1 in 326 |
| 5 | 1 in 1,551 |
| 10 | 1 in 8,911,711 |
Matching ten out of ten is roughly a 1 in 8.9 million event. Here is the more realistic picture: with 10 spots you hit 2.5 numbers on average. In over half of all rounds you get two or three (29.5% and 26.7%). Five hits come up in 5.1% of rounds, and in 4.6% you hit none at all.
Why the keno house edge is so high
The house edge exists because the paytable pays less than the true odds. Take one spot as a worked example. You hit one time in four, so a fair payout would return four times your stake. If the table returns three times instead, 75% of all stakes flow back and the house keeps 25%.
That is the range traditional keno operates in. In land-based venues and lottery keno the house edge typically sits between 20% and 35%. Online versions are usually cheaper, yet still far more expensive than table games.
For comparison, European roulette has a 2.7% edge, and blackjack played by the standard rules with correct strategy about 0.5%. Sixty rounds at CHF 2 means CHF 120 staked. At a 25% edge the expected cost is CHF 30. At roulette it is CHF 3.24.
Speed makes it worse. An online draw takes a few seconds, and a high edge multiplied by many rounds per hour adds up quickly. Our calculators let you check how return rate and number of rounds affect a budget.
Hot and cold numbers: a myth
Many keno games display statistics showing which numbers came up often recently (“hot”) and which have been absent (“cold”). None of it says anything about the next draw. Each round is independent, and every number is back at exactly 25%.
Long absences are normal. The chance that one particular number misses ten draws in a row is 5.6%. Across 80 numbers, that means four or five of them are “cold” for ten rounds at any given moment, for no reason at all.
Patterns on the card, birthdays and quick picks make no difference either. Expected value depends only on the paytable and the number of spots.
FAQ
How many numbers should you pick in keno? There is no universally best number; it depends on the specific paytable. Few spots give frequent small hits. Many spots give long dry spells and rare large payouts.
Is there a keno strategy that works? None that lowers the house edge. All you can control is volatility, through the number of spots and the size of your stake.
What are the odds of hitting 10 out of 10? With ten numbers picked, 1 in 8,911,711.
Can you play keno for free? Yes, with play money in demo versions. The free games section has demos where you can learn rules and paytables without risk.