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World at Odds tracks every bet on a public scorecard. 13 bets, 0 losses. Listen to hear the math behind each pick.
Listen on SpotifyEnter odds for each leg of your parlay in any format. See your total odds, payout, and profit instantly. Supports 2–15 legs.
World at Odds tracks every bet on a public scorecard. 13 bets, 0 losses. Listen to hear the math behind each pick.
Listen on SpotifyA parlay (also called an accumulator or multi-bet) combines two or more individual bets into one. Every leg must win for the parlay to pay out. The upside is a much bigger payout than betting each leg separately. The downside is that one loss kills the entire bet.
Pick your odds format (American, decimal, or fractional) using the toggle at the top. Enter the odds for each leg of your parlay. Add more legs with the "+ Add Leg" button — up to 15 total. Enter your wager amount and the calculator shows your total parlay odds, payout, and profit instantly.
The math is straightforward: convert every leg to decimal odds, then multiply them all together. A 3-leg parlay with decimal odds of 1.91, 2.10, and 1.50 gives you 1.91 × 2.10 × 1.50 = 6.02 total decimal odds. A $100 bet pays $602 total ($502 profit).
In American odds, that same parlay would show as roughly +502. The implied probability of hitting all three legs is about 16.6% (1 / 6.02).
Parlays offer the chance to turn small stakes into big payouts. A $10 four-leg parlay at typical -110 odds (1.91 decimal) pays $132.83. That same $10 split across four individual $2.50 bets would return just $19.09 total if all four hit. The tradeoff is clear: bigger payout, lower probability.
That said, parlays can be +EV when you have an edge on individual legs — use our EV calculator to check each leg first.
This is the part sportsbooks don't advertise. On a single -110 bet, the house edge is about 4.5%. That's manageable. But on a parlay, the vig from each leg multiplies together, and the house edge grows fast:
| Legs | Fair Decimal | Actual at -110 | House Edge |
|---|---|---|---|
| 1 | 2.00 | 1.91 | 4.5% |
| 2 | 4.00 | 3.64 | 8.9% |
| 3 | 8.00 | 6.96 | 13.0% |
| 4 | 16.00 | 13.28 | 17.0% |
| 5 | 32.00 | 25.36 | 20.8% |
| 6 | 64.00 | 48.41 | 24.4% |
| 8 | 256.00 | 176.45 | 31.1% |
| 10 | 1024.00 | 643.08 | 37.2% |
"Fair Decimal" is what you'd get at true 50/50 odds (2.00 per leg). "Actual at -110" is what the sportsbook actually pays. The gap is the house edge, and it grows from 4.5% on a single bet to over 31% on an 8-legger. A 10-leg parlay gives the book a 37% edge — nearly 14x the house edge on European Roulette (2.7%).
The takeaway: parlays aren't inherently bad, but the more legs you add, the more you're paying in compounded vig. If you're going to parlay, keep it short (2–3 legs) and make sure each leg has a real edge. Use our no-vig calculator to strip the juice and see the true odds before you build.
If your parlay legs don't kick off at the same time, you can run a "manual parlay" (also called a rolling parlay). Instead of placing one parlay bet, you bet your stake on Leg 1. If it wins, you take the entire payout and bet it all on Leg 2. Then Leg 2's payout goes onto Leg 3, and so on.
If every game is at the same sportsbook and the same odds, the payout is mathematically identical to a traditional parlay. But here's where it gets interesting: between legs, you can shop for the best line across multiple books. Even shaving a few cents off each line adds up fast as the legs compound.
Assume you can find -107 on average by shopping (instead of -110 at one book). That drops the effective overround per leg from ~5% to ~3.5%. Here's what that looks like on a $100 bet:
| Legs | Traditional Parlay (-110) | Manual w/ Shopping (-107 avg) | You Save |
|---|---|---|---|
| 2 | $364 | $374 | +$10 |
| 3 | $696 | $724 | +$28 |
| 4 | $1,328 | $1,401 | +$73 |
| 5 | $2,536 | $2,710 | +$174 |
| 6 | $4,841 | $5,243 | +$402 |
| 8 | $17,645 | $19,621 | +$1,976 |
The estimated house edge drops too: from 9.3% to 6.6% on a 2-legger, from 17.7% to 12.9% on a 4-legger, and from 32.3% to 24.1% on an 8-legger. The longer the parlay, the more line shopping saves you.
Beyond the math, manual parlays give you two more advantages: you can bail out early if new information changes your mind on a later leg, and you avoid same-game parlay restrictions that limit which bets you can combine. The only requirement is that your legs don't overlap in time — you need each result before placing the next bet.
Prediction market platforms like Polymarket and Kalshi don't offer traditional parlays, but you can build multi-position portfolios that function similarly. The key difference: prediction market prices already reflect the market's implied probability, so you're not fighting a built-in house edge — just other traders. Use our prediction market converter to translate between formats.
Want a deeper dive into how parlays work, when to use them, and common mistakes? Read our complete guide: What Is a Parlay Bet? How Parlays Work, Odds, Payouts & Strategy
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