Parlay Calculator — Parlay Odds & Payout for 2–6 Legs

Using the parlay calculator is straightforward. Start by entering your stake — the amount you want to wager on the entire parlay. Next, choose the number of legs (selections) you want to include, from 2 up to 6. Then enter the American odds for each leg.

American odds are the standard format used by US sportsbooks. Favorites are listed with a minus sign (e.g., -110, -150) and underdogs with a plus sign (e.g., +120, +300). The default odds of -110 represent a standard point spread where you must bet $110 to win $100.

Click Calculate Parlay to instantly see your combined decimal odds, combined American odds, total payout, potential profit, and the implied probability of all legs winning.

As you add more legs, the combined odds multiply and the payout grows — but so does the difficulty. Every additional leg reduces the probability of the parlay winning. The implied probability figure shows you exactly how likely your parlay is to cash, based purely on the odds (excluding sportsbook vig).

A parlay works by multiplying the decimal odds of every leg together. Here is the step-by-step calculation:

1. Convert American odds to decimal odds:
   • Positive odds (underdog): decimal = (americanOdds ÷ 100) + 1
     Example: +150 → (150 ÷ 100) + 1 = 2.50
   • Negative odds (favorite): decimal = (100 ÷ |americanOdds|) + 1
     Example: -110 → (100 ÷ 110) + 1 ≈ 1.909
2. Combined decimal odds = leg1 × leg2 × leg3 × … × legN
3. Potential payout = stake × combined decimal odds
4. Potential profit = payout − stake
5. Implied probability (%) = (1 ÷ combined decimal odds) × 100
6. Convert combined decimal back to American:
   • If decimal ≥ 2.0: american = (decimal − 1) × 100
   • If decimal < 2.0: american = −100 ÷ (decimal − 1)

The key insight is that every additional leg multiplies the odds — so while the potential payout grows quickly, the probability of winning shrinks just as fast. A 6-leg parlay at -110 per leg has combined odds of roughly 46.6, meaning there is only about a 2.1% chance of hitting.

Example 1 — Standard 2-Leg Parlay (Both -110)

• Stake: $100
• Leg 1: -110 → decimal 1.909
• Leg 2: -110 → decimal 1.909
• Combined decimal odds: 1.909 × 1.909 ≈ 3.645
• Combined American odds: approximately +265
• Payout: $364.50 | Profit: $264.50
• Implied probability: 27.4%

This is the most common parlay at US sportsbooks. You need to win both legs to collect. Each individual leg has a roughly 52% chance of winning (at -110), so the combined probability is about 0.52 × 0.52 = 27% — a coin-flip multiplied by itself.

Example 2 — 3-Leg Parlay with a Mix of Favorites and Underdogs

• Stake: $50
• Leg 1: -110 → decimal 1.909
• Leg 2: +130 → decimal 2.300
• Leg 3: -150 → decimal 1.667
• Combined decimal odds: 1.909 × 2.300 × 1.667 ≈ 7.32
• Payout: $366 | Profit: $316
• Implied probability: 13.7%

Adding an underdog (+130) dramatically increases the payout compared to a 3-leg all-chalk parlay. The tradeoff is a lower probability of hitting that underdog leg.

Example 3 — 4-Leg Same-Game Parlay

• Stake: $25
• All four legs at +100 (even money)
• Combined decimal odds: 2.0 × 2.0 × 2.0 × 2.0 = 16.0
• Combined American odds: +1500
• Payout: $400 | Profit: $375
• Implied probability: 6.25%

Even at even money odds, a 4-leg parlay is only a 6.25% shot. This illustrates why parlays are high-variance bets — the sportsbook's edge compounds across every leg.

The Hidden Cost of Parlays

Parlays look attractive because of the large advertised payouts, but the sportsbook's vig compounds on every leg. On a 2-leg -110/-110 parlay, the true fair payout (no-vig) would be approximately +300, but sportsbooks pay roughly +260 to +265. That gap represents compounded juice. For long-term profitable betting, single-game wagers with low vig are almost always superior to parlays.