Parlay Calculator: Compute Your Multi-Bet Payout Instantly
A free parlay calculator that computes the combined odds, total payout, profit, and implied win probability for any multi-leg bet. Supports American, decimal, and fractional odds.
On this page
Parlay odds are calculated by multiplying the decimal odds of each leg. Implied probability = 1 / combined decimal odds. This does not account for the vig (juice) — actual probabilities are slightly higher than the implied odds suggest.
The short answer
A 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, but the combined odds — and therefore the potential payout — grow with every leg you add. The calculator above lets you enter your legs in American, decimal, or fractional odds and instantly see the combined payout, profit, and implied probability of hitting them all.
Key takeaway: Parlays are high-risk, high-reward. A two-leg parlay at -110 / -110 pays roughly 2.6 to 1, but your implied win probability is only about 25%. Every leg you add makes the payout bigger and the probability smaller. The calculator shows both numbers so you can decide whether the risk-reward trade-off makes sense.
How to use the parlay calculator
- Pick your odds format — American (-110, +200), decimal (1.91, 3.00), or fractional (10/11, 2/1). All three are interchangeable; the calculator converts internally.
- Enter your legs — type the odds for each bet. Add more legs with the "+ Add leg" button, or remove legs with the ✕ button.
- Set your wager — how much you're betting on the parlay.
- Read the results — combined odds, total payout (wager + profit), profit alone, and the implied win probability.
You can optionally label each leg (e.g. "Chiefs ML", "Over 45.5") to keep track of what you're betting on.
How parlay odds are calculated
The math behind a parlay is simple: convert every leg to decimal odds, then multiply them all together. The result is the combined decimal odds for the entire parlay.
Example: Three legs at -110, +150, and -200.
- Leg 1: -110 → decimal 1.909
- Leg 2: +150 → decimal 2.500
- Leg 3: -200 → decimal 1.500
Combined: 1.909 × 2.500 × 1.500 = 7.16
On a $10 wager: $10 × 7.16 = $71.59 total payout ($61.59 profit).
The implied probability of all three hitting: 1 / 7.16 = 13.97%. That means if you placed this same parlay 100 times, you'd expect to win roughly 14 of them (before accounting for the vig).
For a detailed explanation of each odds format and how the conversions work, see our guide on how betting odds work. The odds formats lesson in our sports betting course covers the same material step by step.
What is the vig and how does it affect parlays?
The vig (or juice) is the sportsbook's built-in margin. When you see -110 on both sides of a market, the true probability of each outcome is 50%, but the implied probability at -110 is 52.4%. That 2.4% gap is the vig. In a parlay, the vig compounds with every leg — each additional leg adds another layer of the sportsbook's edge.
This is why parlays are more profitable for the sportsbook than straight bets, and it's also why the payout looks so attractive to bettors. The calculator shows the implied probability based on the odds you enter, which includes the vig. Your true win probability is slightly higher than the number shown. For more on how the vig works, see our lesson on the vig explained.
Are parlays a good bet?
It depends on your goals. Parlays are mathematically worse than placing the same bets individually because the vig compounds. A $10 bet on three separate -110 moneylines has a higher expected return than a $10 three-leg parlay on the same games.
But parlays exist for a reason: they offer a large payout from a small wager. If you're betting recreationally and want a shot at a bigger number, a parlay is a structured way to do that. The key is understanding the trade-off: you're paying a higher effective vig in exchange for a higher payout ceiling.
For strategies on finding value in parlays and understanding when correlated parlays make mathematical sense, see our parlays and props lesson.
Parlay odds table
Here's a quick reference for what standard -110 legs pay as a parlay:
Legs | Combined odds | $10 payout | Implied probability |
|---|---|---|---|
2 | +264 | $36.36 | 27.5% |
3 | +596 | $69.59 | 14.4% |
4 | +1,228 | $132.84 | 7.5% |
5 | +2,435 | $253.50 | 3.9% |
6 | +4,741 | $484.14 | 2.1% |
7 | +9,141 | $924.36 | 1.1% |
8 | +17,452 | $1,764.96 | 0.6% |
Notice how the probability roughly halves with each added leg. An eight-leg parlay at -110 per leg has about a 0.6% chance of hitting — less than 1 in 170 attempts.
What should I learn next?
- How Betting Odds Work: Full guide to reading and converting American, decimal, and fractional odds
- Parlays and Props: When parlays make sense and when they don't
- The Vig Explained: How the sportsbook's margin works and why it compounds in parlays
- Value Betting: How to find bets where the odds are in your favour
- Sports Betting Fundamentals Course: The full structured course, lesson by lesson
About the author
Trust & Responsible Play Writer
Marcus focuses on judging casinos before you deposit — licensing checks, red flags, scam patterns — and the bankroll habits and limit tools that keep play under control.