What Is a Parlay Bet?
A parlay (also called an accumulator or combo bet) combines multiple individual bets into one wager. All selections (legs) must win for the parlay to pay out. In exchange for higher risk, you get significantly higher potential payouts.
The Core Concept
| Aspect | Single Bets | Parlay |
|---|---|---|
| Number of bets | 1 | 2-15+ |
| Risk | Lower | Higher |
| Payout | Lower | Much higher |
| Requirement | That bet wins | ALL bets win |
Example: Instead of betting $100 on three separate games, you bet $100 on all three combined. If all three win, your payout is much larger than three individual wins.
How the Parlay Calculator Works
Step 1: Select Odds Format
Choose your preferred odds format:
- American (-110, +150, +200) - US standard
- Decimal (1.91, 2.50, 3.00) - European standard
- Fractional (10/11, 3/2, 2/1) - UK standard
Step 2: Enter Your Stake
Input the total amount you want to wager on the parlay.
Step 3: Add Your Legs
Enter the odds for each selection. Add more legs using the “Add Leg” button (up to 15 legs).
Step 4: Set Outcomes
For each leg, select the outcome:
- Win - Selection won
- Lose - Selection lost (parlay loses)
- Push - No action (leg removed from parlay)
Step 5: View Results
The calculator displays:
- Combined odds in your chosen format
- Implied probability of winning
- Total payout if successful
- Profit (payout minus stake)
- Parlay status (win/lose/push)
Parlay Odds Calculation
The Formula
For decimal odds:
Combined Odds = Odds1 × Odds2 × Odds3 × ... × OddsN
Example: 3-Leg Parlay
Legs:
| Leg | American | Decimal |
|---|---|---|
| 1 | -110 | 1.909 |
| 2 | +150 | 2.500 |
| 3 | -120 | 1.833 |
Calculation:
Combined Decimal = 1.909 × 2.500 × 1.833 = 8.75
Combined American = +675
With $100 stake:
- Payout: $875
- Profit: $775
Parlay Payout Examples
2-Leg Parlay
| Leg 1 | Leg 2 | Combined | $100 Payout |
|---|---|---|---|
| -110 | -110 | +264 | $364 |
| -110 | +100 | +373 | $473 |
| +100 | +100 | +300 | $400 |
| -110 | +150 | +479 | $579 |
3-Leg Parlay
| All Legs | Combined | $100 Payout |
|---|---|---|
| -110, -110, -110 | +596 | $696 |
| -110, -110, +150 | +900 | $1,000 |
| +100, +100, +100 | +700 | $800 |
Large Parlays
| # of Legs | All at -110 | $100 Payout |
|---|---|---|
| 4 | +1228 | $1,328 |
| 5 | +2435 | $2,535 |
| 6 | +4741 | $4,841 |
| 7 | +9147 | $9,247 |
| 10 | +64,281 | $64,381 |
Understanding Push/Void Legs
When a leg results in a push (tie or void):
- That leg is removed from the parlay
- Remaining legs form a smaller parlay
- Odds are recalculated accordingly
Example:
- Original: 4-leg parlay at +1228
- One leg pushes
- Result: 3-leg parlay at remaining combined odds
Implied Probability and True Odds
Why Parlays Favor the Bookmaker
Each leg carries the bookmaker’s margin. In a parlay, these margins compound:
| Bet Type | True Prob | With Vig | Difference |
|---|---|---|---|
| Single (-110) | 50.0% | 52.4% | +2.4% |
| 2-leg parlay | 25.0% | 27.5% | +2.5% |
| 3-leg parlay | 12.5% | 14.4% | +1.9% |
| 5-leg parlay | 3.13% | 4.0% | +0.87% |
The more legs, the more the odds work against you in absolute terms.
Calculating True Parlay Probability
True Probability = Prob1 × Prob2 × Prob3 × ... × ProbN
Example: Three 50% bets:
0.50 × 0.50 × 0.50 = 0.125 = 12.5%
Parlay Strategies
Strategy 1: Correlated Parlays
Combine bets that logically relate to each other:
Good correlations:
- Team to win AND game Over (if team scores a lot)
- Pitcher to throw strikeouts AND game Under (dominant pitchers)
- First touchdown scorer AND team to win
Why it works: If one happens, the other is more likely.
Strategy 2: Small Parlays (2-3 Legs)
Advantages:
- Higher win probability
- Still get decent odds boost
- Less variance
Example: 2-leg parlay of two -110 favorites pays +264 instead of flat betting both.
Strategy 3: Same Game Parlays (SGPs)
Combine multiple bets within the same game:
- Player props + game total
- Multiple player props
- Team outcomes + individual performances
Note: SGP odds may be adjusted for correlation.
Strategy 4: Round Robin Parlays
Create all possible parlay combinations from your selections:
- 3 picks = 3 two-leg parlays
- 4 picks = 6 two-leg parlays + 4 three-leg parlays
Benefit: Don’t need all picks to win, but still get parlay odds.
When to Bet Parlays
Good Situations
| Scenario | Why |
|---|---|
| Correlated outcomes | Increases true probability |
| Small 2-3 leg combinations | Manageable risk |
| Entertainment purposes | High excitement, low stakes |
| Value across books | Arbitrage-like situations |
| Promotional offers | Free bets, boosts |
Bad Situations
| Scenario | Why Not |
|---|---|
| Large 5+ leg parlays | Probability too low |
| Unrelated selections | No correlation benefit |
| Chasing losses | Compounds risk |
| Main betting strategy | Negative long-term EV |
Parlay Math: The Hard Truth
Expected Value Calculation
For a fair coin flip parlay (-110 odds each):
Single bet EV:
EV = (0.50 × 0.91) - (0.50 × 1.00) = -4.5%
2-leg parlay EV:
Win Prob = 0.50 × 0.50 = 0.25
EV = (0.25 × 2.64) - (0.75 × 1.00) = -9.0%
The EV percentage stays similar, but absolute expected loss increases.
Long-Term Impact
| Bet Type | Bets/Year | Avg Stake | Expected Loss |
|---|---|---|---|
| Singles (-110) | 100 | $100 | $455 |
| 2-leg parlays | 100 | $100 | $455 |
| 5-leg parlays | 100 | $100 | $455 |
Key insight: Expected loss is similar, but variance is much higher with parlays.
Parlay vs Straight Bets
Scenario: $300 to bet on 3 games
Option A: Three $100 straight bets
- If 2 of 3 win at -110: +$82 profit
- If 1 of 3 wins at -110: -$118 loss
- If all 3 win: +$273 profit
Option B: One $300 parlay
- If all 3 win: +$1,791 profit
- If ANY lose: -$300 loss
Risk/Reward Comparison
| Outcome | Straight Bets | Parlay |
|---|---|---|
| 3 wins | +$273 | +$1,791 |
| 2 wins | +$82 | -$300 |
| 1 win | -$118 | -$300 |
| 0 wins | -$300 | -$300 |
Parlays have higher upside but no middle ground.
Common Parlay Mistakes
Mistake 1: Too Many Legs
Adding legs dramatically reduces win probability:
| Legs | Win Probability (50% each) |
|---|---|
| 2 | 25.0% |
| 3 | 12.5% |
| 5 | 3.1% |
| 8 | 0.4% |
| 10 | 0.1% |
Solution: Limit parlays to 2-4 legs.
Mistake 2: Ignoring Correlation
Blindly combining unrelated bets doesn’t improve odds.
Solution: Look for logically connected outcomes.
Mistake 3: Parlay-Only Betting
Using parlays as primary strategy guarantees long-term losses.
Solution: Use parlays sparingly for entertainment, not profit.
Mistake 4: Chasing with Big Parlays
Trying to recover losses with long-shot parlays rarely works.
Solution: Stick to bankroll management principles.
Frequently Asked Questions
What happens if one leg of my parlay pushes?
If a leg pushes (ties or is voided), that leg is removed from the parlay and the remaining legs form a smaller parlay. A 4-leg parlay with one push becomes a 3-leg parlay at the recalculated odds.
How many legs can a parlay have?
Most sportsbooks allow parlays with 2-15 legs. Some may allow more for certain bet types. However, the more legs, the lower your probability of winning, so larger parlays are high-risk bets.
Are parlays a good betting strategy?
Parlays offer higher payouts but lower win probability. For long-term profit, straight bets are generally better. Parlays are best used sparingly for entertainment or with correlated selections where one outcome increases the likelihood of another.
What’s the difference between a parlay and an accumulator?
They’re the same thing. ‘Parlay’ is used in North America, while ‘accumulator’ or ‘acca’ is the British/European term. Both refer to combining multiple bets where all selections must win.
Why do parlays pay so much more?
Parlay odds multiply together, creating much higher combined odds. However, the probability of winning also multiplies downward. The higher payout compensates for the much lower chance of winning.
Can I cash out a parlay early?
Many sportsbooks offer cash out options for parlays before all legs settle. The cash out value depends on which legs have won and the current odds of remaining legs. This lets you lock in profit or minimize loss.
Start Calculating Your Parlay
Use our free parlay calculator above to:
- Select your odds format (American, decimal, fractional)
- Enter your total stake
- Add odds for each leg (up to 15)
- Track outcomes (win/lose/push)
- See combined odds and potential payout instantly
The calculator updates in real-time as you enter odds, showing you exactly what your parlay would pay if successful.
Pro tip: Start with 2-3 leg parlays to keep your win probability reasonable while still enjoying the boosted payouts.