Parlay Calculator
Calculate exact payouts, combined odds, and true win probability for any multi-leg parlay.
What Is a Parlay Bet?
A parlay (also called an accumulator or multi-bet) combines two or more individual bets into a single wager. Every selection must win for the parlay to pay out, but the combined odds multiply together, creating significantly larger potential payouts from a modest stake.
For example, a $10 three-leg parlay with each leg at -110 pays approximately $59.50 — compared to $19.09 if you bet each leg separately at $10. The multiplicative effect is what makes parlays so appealing, but it comes at a cost: each additional leg compounds the bookmaker's edge.
Parlays are among the most popular bet types in sports betting. They offer excitement and huge payout potential, but they require every single leg to hit. Understanding the true odds and implied probability of your parlay is essential before placing the wager.
How the Parlay Calculator Works
Enter the odds for each leg of your parlay (in American, decimal, or fractional format) and your stake amount. The calculator converts all odds to a common format, multiplies them together to get the combined parlay odds, and computes the total payout, profit, and combined implied probability.
The calculator also shows the breakeven win rate — the percentage of time every leg would need to hit for the parlay to be profitable long-term. This is critical for evaluating whether a parlay offers value or is a losing proposition over time.
For advanced users, the calculator supports round-robin sub-parlays, which break a larger parlay into all possible smaller combinations. This gives you multiple ways to profit even if one leg loses.
Understanding Parlay Math
The core math behind parlays is multiplication. Each leg's decimal odds are multiplied together. If you have three legs at 1.91, 2.10, and 1.83, the combined decimal odds are 1.91 × 2.10 × 1.83 = 7.34. A $10 bet pays $73.40 total ($63.40 profit).
The house edge on parlays compounds with each leg. A single -110 bet carries a 4.5% house edge. A two-leg parlay at -110 per leg has an 8.8% edge. By six legs, the house edge exceeds 25%. This is why sportsbooks love parlays and why sharp bettors are selective about when they use them.
Correlated parlays (where outcomes are linked) can sometimes offer value, but most sportsbooks restrict or prohibit these. The calculator assumes independent outcomes, which is the standard for most parlay markets.
Worked Example: 3-Leg NFL Parlay
You want to bet a three-leg NFL Sunday parlay: Chiefs -3 (-110), Bills ML (-150), and the Over 47.5 in the Packers game (-105).
- Convert to decimal: -110 → 1.909, -150 → 1.667, -105 → 1.952
- Multiply combined odds: 1.909 × 1.667 × 1.952 = 6.211
- Combined American odds: +521
- Stake: $25
- Total payout: $25 × 6.211 = $155.28
- Profit if all three hit: $130.28
- Combined implied probability: 16.1% (all three must hit)
Your $25 three-leg parlay pays $155.28 if all three legs win. The combined implied probability is 16.1%, meaning you need to believe all three outcomes happen together more than 16.1% of the time for this to be a +EV bet.
Frequently Asked Questions
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