Keno House Edge: Why It Ranges From 1% to 40%

Keno's house edge isn't a single number, it's a range: from a claimed 1% at some online crypto casinos to more than 40% at live Las Vegas lounges, with the worst surveyed lounges pushing past 50%. Every published figure is accurate for a different format and paytable. The house edge itself is just the average share of every dollar wagered the game keeps over the long run — the mirror image of RTP (return to player), since the two always sum to 100%.

What actually drives the difference between paytables?

The draw itself never changes: 20 numbers pulled from 80, with fixed probabilities no venue can touch. What varies entirely is the paytable, what each catch pays. Pay a little less on a catch, keep a little more of the money. That single lever explains the whole spread below.

Reconciled by format, published figures run roughly: online crypto keno (1% claimed, unverified, different 40-ball math); best online RNG 80-ball paytables (under 4% to ~10%); video keno machines (5% to 16%, per a 2008 San Diego survey); live lounge keno in Las Vegas (20% to 43%, old and new surveys agree); state lottery keno like Massachusetts (about 30%); and the worst Laughlin lounges surveyed (26% to 50%). None of these figures contradict each other — they're describing different products wearing the same name.

What does one game with seven paytables prove?

Wizard of Odds' Spot Keno page proves the paytable is the whole story: seven real casino paytables for identical pick-10 tickets return anywhere from 86.43% to 94.95%. Both extremes pay the same 10,000x jackpot for a solid ten; the nearly 7-point gap hides entirely in the middle rows, where one table pays 146x on a 7-catch and another pays 120x. Players compare jackpots. Venues bank the difference in the rows nobody checks — the same dynamic covered row by row in the payout charts lesson.

State lottery keno keeps roughly 30 cents of every dollar. Wild Academy's own 2026 calculation from published Maryland, Ohio, and Massachusetts prize structures found Massachusetts landing at 69-70% return across nearly every spot count, matching a 2023 report quoting a mathematics professor's "the lottery can get 30% of your money in the long run by being honest." Ohio's 9-spot returns roughly 64.81%, in line with its 8-spot and 10-spot neighbors — Ohio's paytables hold remarkably steady across spot counts rather than singling out any one spot count as unusually bad.

Why does pace multiply the paytable's effect?

Format sets the neighborhood, but the paytable sets the price, and pace multiplies it. Live lounge keno at 30% edge runs only a handful of games per hour, keeping the hourly cost modest despite the steep per-dollar cut. Video keno at a friendlier 10% edge can run hundreds of games an hour, which can cost more per hour than the "worse" lounge bet. No number-picking method, discussed in the best numbers lesson, moves any of these figures by a decimal — the paytable and your pace are the only levers that exist.

The practical rule: read the paytable before you play, focus on the unglamorous middle catches rather than the jackpot, and budget as if you'll pay the full edge, because on average you will.

Sources

• Wizard of Odds — Spot Keno — retrieved July 2026
• Vegas Advantage — Las Vegas live keno survey — retrieved July 2026
• GBH News — Is Keno in Massachusetts fair? — retrieved July 2026
• Maryland Lottery — Keno prize structure — retrieved July 2026
• Ohio Lottery — KENO — retrieved July 2026