Parlay Calculator
How To Use This Calculator
The parlay calculator computes your combined odds, total payout, and profit for multi-leg parlays. Add as many legs as you need and see results update in real-time.
Input the total amount you want to wager on the parlay.
Enter the odds for each selection in your parlay. Use the + button to add more legs.
See combined odds, payout, profit, and implied probability instantly.
What is a Parlay Bet?
A parlay bet (also known as an accumulator or combo bet) combines two or more individual wagers into a single bet. All legs must win for the parlay to pay out.
The appeal of parlays is the multiplied odds -- each leg increases the potential payout exponentially. However, the probability of winning decreases with each added leg, making parlays inherently riskier than straight bets.
Combined Odds = Leg1 x Leg2 x ... x LegNHow Parlay Payouts Are Calculated
A parlay payout is the product of all individual leg odds multiplied by your stake. Each leg you add multiplies the combined odds, which is why parlay payouts grow so quickly.
Leg 1: Cowboys -3 at -110 (decimal 1.909)
Leg 2: Lakers ML at +150 (decimal 2.500)
Leg 3: Over 7.5 runs at -120 (decimal 1.833)
Combined odds: 1.909 x 2.500 x 1.833 = 8.751
On a $100 stake: payout = $875.10, profit = $775.10
Implied probability: 1 / 8.751 = 11.4%
If your sportsbook uses American odds, convert each leg to decimal first. For positive odds like +150: divide by 100 and add 1 (2.50). For negative odds like -110: divide 100 by the absolute value and add 1 (1.909). Then multiply all decimal values together.
The vig compounds across legs. Each -110 leg carries about a 4.5% house edge. In a 4-leg parlay, the combined house edge is roughly 17%, compared to 4.5% on a single straight bet. This is why sportsbooks promote parlays aggressively.
Parlay Payout Reference (Even Odds)
How payouts scale with each additional leg at even odds (2.00 decimal / +100 American) on a $100 stake.
| Legs | Combined Odds | Payout | Profit | Win Prob. |
|---|---|---|---|---|
| 2 | 4.00 | $400 | $300 | 25.00% |
| 3 | 8.00 | $800 | $700 | 12.50% |
| 4 | 16.00 | $1,600 | $1,500 | 6.25% |
| 5 | 32.00 | $3,200 | $3,100 | 3.13% |
| 6 | 64.00 | $6,400 | $6,300 | 1.56% |
| 7 | 128.00 | $12,800 | $12,700 | 0.78% |
| 8 | 256.00 | $25,600 | $25,500 | 0.39% |
The House Edge on Parlays
Every leg in a parlay includes the sportsbook's vig. On a standard -110 line, the true probability is 50% but the implied probability is 52.4%. That 2.4% gap is the house edge on a single bet.
In a parlay, this edge compounds with each leg. A 2-leg parlay at -110 per leg has a combined house edge of about 9%. A 4-leg parlay jumps to roughly 17%. By 8 legs, the house edge exceeds 30%.
| Legs | Fair Payout | Actual Payout | House Edge |
|---|---|---|---|
| 1 | $200 | $190.91 | 4.5% |
| 2 | $400 | $364.46 | 8.9% |
| 3 | $800 | $696.15 | 13.0% |
| 4 | $1,600 | $1,329.35 | 16.9% |
| 5 | $3,200 | $2,538.11 | 20.7% |
| 6 | $6,400 | $4,845.36 | 24.3% |
This is why professional bettors rarely make large parlays. The house edge grows too quickly. If you do parlay, keep it to 2-3 legs and make sure each leg has positive expected value.
Types of Parlay Bets
Combine bets from a single game, like a team to win, a player to score 20+ points, and the total to go over. Sportsbooks price SGPs using proprietary correlation models, which usually means higher margins than traditional parlays. The outcomes are correlated, so the true combined probability isn't just the product of each leg's probability.
Instead of one big parlay, a round robin creates every possible smaller parlay from your selections. If you pick 4 teams, you get six 2-team parlays, four 3-team parlays, and one 4-team parlay. This spreads risk because one loss doesn't kill everything. Use our round robin calculator to see all combinations. Round Robin Calculator →
A special parlay where you buy points on each spread or total. You get more favorable lines in exchange for lower payouts. A 6-point teaser on two NFL games moves each spread 6 points in your favor. Teasers only make sense when the point adjustment crosses key numbers (like 3 and 7 in football).
Some sportsbooks offer parlays that still pay out if one or two legs lose, at a reduced rate. The payout drops significantly for each missed leg, and the breakeven point is usually worse than making the same bets as straight wagers.
When Parlays Actually Make Sense
If every leg in your parlay has positive expected value, the combined parlay also has positive EV. In fact, parlaying +EV legs multiplies your edge. A 2-leg parlay where each leg has a 3% edge has a combined edge of roughly 6%. This is the only mathematically sound reason to parlay.
When two outcomes are positively correlated but the sportsbook prices them independently, a parlay can have a higher expected value than the individual legs suggest. Example: betting a team to win and the game to go over when that team's wins are associated with high-scoring games.
If you're betting a small amount for fun and accept the negative expected value, parlays offer the biggest potential payoff per dollar risked. This is recreation, not a strategy. Just keep the stakes small and the expectations realistic.
Large parlays (6+ legs) with -EV selections are the worst bets in sports betting. The house edge exceeds 24% and the win probability is under 2%. Sportsbooks promote these heavily because they're their most profitable product. If you wouldn't make each leg as a straight bet, don't parlay it.
Common Mistakes to Avoid
Adding more legs increases potential payout but the probability of winning drops exponentially. A 6+ leg parlay at even odds has less than a 2% chance of winning. Stick to 2-3 legs for realistic win rates.
Correlated legs (where one outcome affects another) change the true probability of your parlay. Sportsbooks price legs independently, so correlated parlays can sometimes be +EV -- but most books restrict them.
Different sportsbooks offer different odds on the same events. Even small differences in leg odds compound across a parlay, significantly affecting your payout. Always shop for the best odds on each leg.
Many recreational bettors throw small amounts at large parlays hoping for a big payout. Over time, this approach has a significant negative expected value. Treat each leg as a serious betting decision.
Frequently Asked Questions
What is the difference between a parlay and an accumulator?
They are the same thing. "Parlay" is the North American term, while "accumulator" (or "acca") is used in the UK and Europe. Both combine multiple selections into a single bet where all legs must win.
How many legs should I include in a parlay?
For serious bettors, 2-3 legs is optimal. Each additional leg dramatically reduces your win probability. A 2-leg parlay at -110 odds each has about a 25% win rate, while a 5-leg parlay drops to about 3%.
Can parlays be profitable long-term?
Parlays can be profitable if each leg has positive expected value (+EV). If you consistently identify +EV selections, combining them into small parlays amplifies your edge. However, parlays with -EV legs compound the house advantage against you.
What happens if one leg of my parlay pushes?
If a leg pushes (ties), most sportsbooks remove that leg from the parlay and recalculate the payout with the remaining legs. For example, a 3-leg parlay with one push becomes a 2-leg parlay.
Do sportsbooks offer parlay bonuses?
Many sportsbooks offer parlay profit boosts (e.g., +25% on 4-leg parlays). While these boosts can add value, read the terms carefully. Some exclude certain markets or cap the boosted payout. Factor in the boost when evaluating your expected value.
What are same game parlays (SGPs)?
Same game parlays combine multiple bets from a single event (e.g., player props + game total + moneyline). Because outcomes within the same game can be correlated, sportsbooks use proprietary models to price SGPs, often with higher margins than traditional parlays.
How do I calculate parlay odds with American odds?
Convert each American odds leg to decimal first. For positive odds: (odds / 100) + 1. For negative odds: (100 / |odds|) + 1. Then multiply all decimal odds together for combined parlay odds. This calculator handles the conversion automatically.
Can I hedge a parlay?
Yes. If all legs have won except the last, you can bet the opposite side of the final leg to guarantee profit regardless of the outcome. Use our hedge calculator to find the exact stake. The more your parlay is worth relative to the hedge cost, the more profit you lock in.
What does a 3-leg parlay pay?
It depends on the odds of each leg. A 3-leg parlay at -110 per leg (1.909 decimal) pays about 6.96x your stake. So a $100 bet returns about $696. At even odds (+100 / 2.00 decimal per leg), a 3-leg parlay pays 8x your stake, or $800 on a $100 bet.
What is parlay insurance?
Some sportsbooks refund your stake (usually as a free bet) if one leg of your parlay loses. Terms vary: it might only apply to parlays with 4+ legs, or cap the refund at a certain amount. Read the terms before relying on it. Parlay insurance reduces your risk but doesn't eliminate the house edge.
What is the difference between a teaser and a parlay?
Both combine multiple legs into one bet where all must win. The difference is that teasers let you adjust the spread or total by a set number of points (usually 6, 6.5, or 7 in football) in your favor. The tradeoff is a lower payout. Teasers are only available for point spreads and totals, not moneylines.
What is the difference between a parlay and a round robin?
A parlay is a single bet where all legs must win. A round robin creates every possible parlay combination from your selections. With 4 picks, you get 11 parlays (six 2-leg, four 3-leg, and one 4-leg). Round robins cost more but give you partial payouts if some legs lose.
Are parlays better than straight bets?
Mathematically, no. The house edge compounds with each leg, making parlays worse value than the equivalent straight bets. A 4-leg parlay at -110 per leg carries roughly a 17% house edge versus 4.5% on each straight bet. Parlays only make sense when each leg has positive expected value, which multiplies your edge instead of the house's.
Pro Tip: Use +EV Legs Only
The only way to make parlays profitable long-term is to ensure each leg has positive expected value. Use our EV Calculator to verify each selection before adding it to your parlay. Combining +EV legs multiplies your edge, while -EV legs compound the house advantage.