You know the feeling. Five legs, four hit, and the last one misses by half a point. You're furious. You're also already building the next one, because you were so close.
That feeling is what the sportsbooks are counting on. Once you see the math behind parlays, you can't unsee it.
How a parlay works
A parlay ties two or more bets together. Every leg has to win or the whole thing loses. Hit three out of four and you get nothing. In exchange, the payout is bigger. That's the hook: a small bet that could turn into a big one.
The parlay math the books don't show you
A normal straight bet is priced at -110. You risk $110 to win $100, and you need to win 52.4% of the time just to break even. With a parlay, that house cut gets multiplied by every leg you add. This is what happens when every leg is a true coin flip priced at -110:
| Legs | Chance all hit | Book pays on $10 | Fair payout | Book keeps, on average |
|---|---|---|---|---|
| 1 (straight) | 1 in 2 | $19.09 | $20 | about 4.5% |
| 2 | 1 in 4 | $36.45 | $40 | about 9% |
| 3 | 1 in 8 | $69.58 | $80 | about 13% |
| 4 | 1 in 16 | $132.83 | $160 | about 17% |
| 6 | 1 in 64 | $484.13 | $640 | about 24% |
| 10 | 1 in 1,024 | $6,430.82 | $10,240 | about 37% |
A 10-leg parlay hits about once in a thousand tries. And even when it does hit, you get paid well under the real odds.
What the sportsbooks' own numbers say about parlays
- New Jersey, September 2024: parlays were 32.2% of the money bet but 72.5% of sportsbook revenue. Books kept 24.2% of parlay money, compared with 4.4% on everything else.
- Illinois, 2023: people placed about 194.6 million parlays, and only 17.74% won. Books kept 18.2% of parlay money, compared with 4.9% on straight bets.
- FanDuel: parlays made up 70% of all NFL and NBA bets placed on the app in 2023.
- Most states that publish this data: parlays bring in between half and two-thirds of sportsbook revenue.
Why sportsbooks push parlays so hard
Look at those numbers and the marketing suddenly makes sense. The celebrity ads. The "Same Game Parlay" button on every screen. Parlay boosts, one-tap bet building, and the endless stories about the one guy who hit. The near miss matters too. Losing by one leg can pull you back in just as hard as a win.
If you're trying to quit parlays
- Notice the "one leg away" feeling. When a near miss makes you want to build another one, that's the hook doing its job.
- Add up the real number. Put what you've spent on parlays over the past year next to what you've won back. Be honest with yourself.
- Block the apps. Start with How to Block Sports Betting Apps.
FAQ
Are parlays ever a good bet?
The sportsbook's cut stacks up with every leg you add, so the more legs, the more the math works against you. That's why books keep a much bigger share of parlay money than straight-bet money.
Why do sportsbooks push parlays so hard?
Because parlays bring in a large share of their revenue. Boosts, one-tap builders and near-miss stories all keep you building the next one.
What if I can't stop betting parlays?
Start with blocking the apps and take the 9 signs self-check.
Not sure where you stand?
Nine yes-or-no questions based on the signs doctors use. Nothing you enter leaves your device.
Take the self-checkSources: Birches Health (New Jersey and FanDuel figures); Birches Health (Illinois); The Washington Post (state revenue share). Payout math assumes each leg is a 50/50 bet priced at -110.
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