Parlay Checker
Combine 2–12 legs to see the payout and the break-even bar, compare a sportsbook's quoted price with the simple product, test pushes and voids, and check whether legs are related or contradict each other.
Your slip
Example slip · illustrative pricesResults
- Total payout
- $70.00
- If every leg wins
- Net profit
- $60.00
- Break-even win rate
- 14.29%
- About 1 in 7.0
- Combined decimal odds
- 7.000
- Product of each leg's decimal odds
- Combined American odds
- +600
| Leg | Odds | Implied probability |
|---|---|---|
| 1. Example Player A over 24.5 points | −110 (1.909) | 52.38% |
| 2. Example Player A over 6.5 assists | +120 (2.200) | 45.45% |
| 3. Team C moneyline | −150 (1.667) | 60.00% |
Each leg's implied probability comes from its own price and includes the book's margin. Multiplying them gives the break-even rate above, not the chance that every leg wins.
How the payout is calculated
Multiplying the 3 legs' decimal odds gives 7.000 (+600). A $10.00 stake returns $70.00 if every leg wins. That is a payout calculation, not the chance that every leg wins.
Learn: Why parlay probabilities are hard
A parlay's payout is usually the product of each leg's decimal odds. That is arithmetic about money.
The chance that every leg wins is a different question. Each leg's price includes margin, and legs can be related, so multiplying implied probabilities does not give a reliable win probability.
What the product does tell you is the break-even rate: how often the whole parlay would need to win at this payout.
Illustrative example · Two −110 legs multiply to decimal 3.645 (+264.46). At that payout the parlay needs to win 27.44% of the time to break even.
The break-even bar
At this payout the parlay needs to win 14.29% of the time (about 1 in 7.0) to break even. Whether it actually wins that often depends on the real chance of each leg and how the legs relate, which this checker does not estimate.
Learn: More legs, a higher bar
Each extra leg multiplies the payout and divides the break-even rate. The margin in each leg's price compounds too.
A big potential payout comes from needing many things to go right. The break-even rate shows how rarely the parlay has to win to be worth its price.
Illustrative example · Legs at −110 each: 1 leg breaks even at 52.38%, 3 legs at 14.37%, 6 legs at 2.07%, and 12 legs at 0.04%.
Dependency checks
- Possible dependency
Same player or team: Example Player A
Leg 1 and Leg 2 all depend on Example Player A in the same event. Results for one subject often move together (minutes played, game script, injuries), so these legs may not behave like separate bets.
Legs: Leg 1, Leg 2
- Possible dependency
Same event: Example game: Team A @ Team B
Leg 1 and Leg 2 are in the same event. Outcomes in one game can be related (pace, score, who plays), and we can't measure by how much. Some sportsbooks also price or restrict same-game combinations differently.
Legs: Leg 1, Leg 2
Warnings come from fixed rules on the details you entered. They don't measure how strongly legs are related, and legs with no warning are not shown to be independent.
Learn: Correlation and same-game parlays
Two legs are correlated when one winning makes the other more (or less) likely. A quarterback's passing yards and the top receiver's yards, or a team winning and the game total, are common examples.
When legs are correlated, multiplying their prices can over- or under-state the real chance of the parlay winning. Sportsbooks know this and often price same-game parlays below the simple product.
These checks can flag legs that share an event, player or market. They cannot measure how strong a relationship is, and no warning does not mean the legs are independent.
Push and void scenarios
Mark legs as pushed or voided to see standard repricing: those legs drop out and the parlay is paid on the rest. This is an illustration. Sportsbooks' rules differ, especially for same-game and boosted parlays.
Learn: Pushes and voids
A push (the result lands exactly on the line) or a void (for example, a player who doesn't play) usually removes that leg, and the parlay is paid on the remaining legs. A straight bet that pushes usually returns the stake.
Rules differ by sportsbook, sport and bet type. Some books void a whole same-game parlay, some reprice boosted parlays differently, and some settle player props on whether the player started. Check your book's house rules.
Illustrative example · Three −110 legs with a $10 stake pay $69.58. If one leg pushes, standard repricing pays the remaining two-leg parlay: $36.45.