Lay bet house edge comes from the commission, not from the true-odds payout itself. A lay bet wins if 7 rolls before the chosen number, so you risk more to win less. The 7 is favored, but the casino charges vig, and that commission turns the fair payout into a house-edge bet.
Quick Facts
- Lay bets are the opposite side of buy bets.
- You bet that 7 will roll before 4, 5, 6, 8, 9, or 10.
- Because 7 is favored, you risk more than you can win.
- The payout is based on true odds before commission.
- The casino commission creates the house edge.
- Lay 4 and Lay 10 usually require the largest risk-to-win ratio.
- Commission rules and rounding change the real cost.
Plain Talk
A lay bet is a bet against a number. You are not cheering for that number. You are betting that 7 arrives first.
Because 7 is more likely than any individual box number, the casino does not pay you even money. You lay more money to win less. Then the casino charges a commission.
This page covers the house edge. For basic table mechanics, read lay bets explained. For broader probability and cost, use the craps guide, craps odds, and craps house edge.
The Wizard of Odds craps basics gives common lay-bet references, the Wizard of Odds craps appendix shows expected-return structure, and the Massachusetts craps rules provide formal regulated craps context.
How It Works
A lay bet wins if 7 rolls before the number you lay against.
| Lay Number | Ways to Roll 7 | Ways to Roll Number | True-Odds Relationship | Common Risk-to-Win Pattern |
|---|---|---|---|---|
| 4 or 10 | 6 | 3 | 7 is twice as likely | Lay $40 to win $20 before vig |
| 5 or 9 | 6 | 4 | 7 is 1.5 times as likely | Lay $30 to win $20 before vig |
| 6 or 8 | 6 | 5 | 7 is 1.2 times as likely | Lay $24 to win $20 before vig |
The true-odds relationship is fair before commission. The vig creates the edge.
Why Lay Bets Feel Strange
Most casino bets ask you to risk less to win more, or risk one unit to win about one unit. Lay bets often ask you to risk more to win less.
That is not a scam by itself. It is the price of betting on the more likely side. The problem is the commission.
Craps Table Example
You lay the 10 for $40 to win $20. The dealer marks the bet with a lay button.
If 7 rolls before 10, the bet wins. If the casino charges $1 commission on the win, your net profit is $19. If 10 rolls before 7, you lose $40.
The player sees a bet that wins more often than it loses. The math sees a smaller win, a larger loss, and a commission. Over time, that commission is the casino’s price.
From the Casino Side:
Lay bets require clean procedure because the amount at risk and amount to win are different. Dealers must set the bet correctly, mark it with a lay button, understand the win amount, and collect commission according to house rules.
The boxman watches lay bets carefully because wrong-side action can confuse players and dealers. A player may think they won when the number rolled, when the lay bet actually lost. Clear calls matter.
Surveillance checks late bets, correct lammer use, and payout math. Lay bets are not the highest-volume wagers on many tables, so procedure errors can happen when staff are weak or rushed.
Common Mistakes
- Thinking lay bets are safe because they win more often.
- Ignoring that losses are larger than wins.
- Forgetting the commission.
- Confusing lay bets with Don’t Pass odds.
- Laying numbers without knowing the required risk-to-win ratio.
- Using lay bets as a loss-chasing tool.
- Assuming all casinos charge vig the same way.
Hard Truth
Lay bets win often enough to feel clever, then lose big enough to remind you what you were risking. Frequency is not the same as value.
FAQ
What is a lay bet in craps?
A lay bet is a bet that 7 will roll before a chosen box number.
Why do I risk more than I win on lay bets?
Because 7 is more likely than any single box number. The payout reflects that probability.
What creates the house edge on lay bets?
The commission, or vig, creates the house edge. The true-odds payout before commission is fair.
Are lay bets the same as Don’t Pass odds?
No. Don’t Pass odds sit behind a Don’t Pass bet. Lay bets are separate number bets with commission.
Which lay bet is best?
It depends on commission rules, rounding, and bet size. No lay bet becomes a player edge under normal rules.
Can lay bets be taken down?
Usually yes, unless house procedure or timing prevents it. Ask the dealer before the dice are out.
Are lay bets good for beginners?
Usually no. They are more confusing than line bets and can create large losses compared with their win amount.
Deeper Insight
Lay bets expose a common player misunderstanding: winning more often does not automatically mean better value.
A lay bet against 4 wins when 7 appears before 4. That happens more often than not because 7 has 6 combinations and 4 has only 3. But the casino knows that too. That is why you must lay $40 to win $20 before commission.
The true odds balance the frequency. The vig breaks the balance in the casino’s favor.
This is also why lay bets can be dangerous psychologically. They can produce several small wins, then one larger loss. Players may feel the bet is working because the hit rate is high. But the risk-to-win ratio and commission are quietly doing the math.
A lay bettor needs discipline. Without it, lay bets become a fancy-looking way to chase losses.
Formula / Calculation
P(event) = favorable dice combinations / total resolving combinations
Expected Value = (Probability of Win × Net Win After Vig) - (Probability of Loss × Amount Risked)
House Edge = -Player EV / Amount RiskedExample: Lay 10 for $40 to win $20 before vig, net $19 after $1 commission on a win.
Ways to roll 7 = 6
Ways to roll 10 = 3
Probability of lay win = 6 / 9 = 2 / 3
Probability of lay loss = 3 / 9 = 1 / 3
EV = (2/3 × $19) - (1/3 × $40)
EV = $12.67 - $13.33 = -$0.66 approx.
House Edge ≈ $0.66 / $40 = 1.65% approx.The effective edge changes with vig timing, commission rounding, and whether the casino measures edge against amount risked or amount won. Always compare using the same basis.
Formula Explanation in Plain English
The 7 is more likely, so you are allowed to bet on the favored side only by risking more than you can win. If the payout were pure true odds, the bet would be fair. The commission makes it a casino-edge wager.
Related Reading
Start with lay bets explained for table procedure, then compare buy bet house edge and place bet house edge. For broader cost control, use craps house edge, the expected loss calculator, and the house edge calculator. If you use lay bets to recover losses, read why betting systems fail before the table teaches the lesson for cash.