Parlay betting is one of the most popular ways to bet sports in the US — the chance to turn a small stake into a big payout is hard to resist. But most bettors don't fully understand how parlay payouts are calculated, which makes it hard to know if a sportsbook is offering fair value. This guide walks through the exact math, with real examples you can verify yourself.
What Is a Parlay Bet?
A parlay (also called an accumulator) combines two or more individual bets into one wager. To win the parlay, every single leg must win. If one leg loses, the entire parlay loses. The reward for this added risk is a significantly larger payout — because each leg's odds are multiplied together, not just added.
For example: if you bet $100 on three separate teams at -110 each and all three won, you'd profit roughly $270. But if you combined those same three teams into a 3-leg parlay, you'd profit approximately $596 — more than double. That's the power of compounding odds.
Step-by-Step: How to Calculate a Parlay Payout
Parlay calculations always work in decimal odds. US sportsbooks display American odds by default, so the first step is always converting to decimal format.
Step 1: Convert American Odds to Decimal
- For positive American odds (+150): Decimal = (American / 100) + 1 → +150 becomes 2.50
- For negative American odds (-110): Decimal = (100 / |American|) + 1 → -110 becomes 1.909
- For even money (+100 or -100): Decimal = 2.00
Step 2: Multiply All Legs Together
Once all legs are in decimal format, multiply them together. This gives you the total parlay decimal odds.
Step 3: Calculate Payout and Profit
- Total Payout = Decimal Odds × Stake → 8.745 × $100 = $874.50
- Profit = Total Payout − Stake → $874.50 − $100 = $774.50
- American Equivalent = (Decimal − 1) × 100 → (8.745 − 1) × 100 = +774
Parlay Payout Reference Table
Here are standard parlay payouts when all legs are -110 (the typical point spread vig), from 2 teams up to 6 teams:
| # Legs | All -110 Parlay Odds | Potential Payout ($100 bet) | Profit | Win Probability |
|---|---|---|---|---|
| 2-team | +260 | $360 | $260 | 27.3% |
| 3-team | +596 | $696 | $596 | 13.0% |
| 4-team | +1,228 | $1,328 | $1,228 | 6.2% |
| 5-team | +2,435 | $2,535 | $2,435 | 2.9% |
| 6-team | +4,713 | $4,813 | $4,713 | 1.4% |
Always use our free parlay calculator to verify payouts before placing your bet. Sportsbooks don't always display the exact decimal calculation.
3-Team Parlay Example: Mixed Odds
Let's say you want to parlay three NFL games on Sunday: the Chiefs -6.5 (-110), the Eagles moneyline (+135), and the Cowboys total over 47.5 (-115). Here's the exact calculation:
Same Game Parlay (SGP) Payouts
Same Game Parlays combine multiple picks from the same game — for example, Patrick Mahomes over 275.5 passing yards AND the Chiefs -6.5 AND the game total under 52. The calculation works the same way (multiply all decimal odds), BUT most sportsbooks apply a correlation discount to SGP legs since they're not truly independent. This means the actual payout will be lower than the standard parlay calculation suggests.
DraftKings and FanDuel both offer SGP+ products that include correlated props. Their in-house calculators automatically apply the correlation adjustment. Our parlay calculator gives you the theoretical maximum — the actual payout may be 10–30% lower on heavily correlated SGP legs.
Why Parlay Payouts Are Lower Than They Should Be
The vig (house edge) compounds across every leg of a parlay. At -110, each leg has a true win probability of about 47.6% — not the implied 52.4%. As you add legs, this gap grows. A 4-team parlay at -110 on each leg should theoretically pay +1,600 at fair odds, but sportsbooks only pay +1,228. The difference is the house's compounded edge.
- 2-team: True value +300, Sportsbook pays +260 → book keeps ~$10 per $100 wagered
- 4-team: True value +1,600, Sportsbook pays +1,228 → book keeps ~$23 per $100 wagered
- 6-team: True value +4,950, Sportsbook pays +4,713 — surprisingly close, meaning sportsbooks are fairly generous on larger parlays
Tips for Parlay Betting
- Always calculate before you bet — use our parlay calculator to verify the payout matches what the sportsbook displays
- Shop for the best odds — even +5 cents difference on each leg compounds significantly in a parlay
- Avoid heavy favorites in parlays — a -400 favorite has only 1.25 decimal odds, contributing very little to the parlay while adding meaningful risk
- Consider 2-3 leg parlays — they offer the best balance of payout vs probability; 5+ leg parlays are more lottery ticket than strategy
- Look for parlay insurance promos at DraftKings and FanDuel — if one leg loses by a small margin, you may get a refund
Ready to calculate your parlay? Use our free Parlay Calculator — enter up to 12 legs in American odds and get the exact payout instantly.