Free Same Game Parlay Calculator & Odds Value Tool

This same game parlay calculator helps you understand what your SGP is actually worth before you place the bet. Enter your legs, see the payout, and compare the sportsbook's offered odds to what the parlay would pay if the legs were independent. The calculator shows you the implied probability, the vig, and the difference between fair odds and what the book is offering.

Same game parlays are high-variance, high-margin bets. This tool is designed to help you make more informed decisions by showing you the numbers in plain English. It is not a guarantee of profit, and it will not turn parlays into good bets if they are not. What it will do is show you exactly what you are paying for.

Same Game Parlay Calculator

Use this calculator to see the payout, implied probability, and vig on your same game parlay. Enter each leg, add the SGP odds offered by your sportsbook, and the calculator will show you the difference between independent parlay odds and the actual SGP price.

Parlays and same game parlays are high-risk bets with a high house edge. Only bet what you can afford to lose. 21+ only.

How to Use This Same Game Parlay Calculator

Using the SGP calculator is simple:

1. Enter each leg and its odds: For example, Patrick Mahomes over 275.5 passing yards at -110, Travis Kelce over 75.5 receiving yards at -110, and the game total over 48.5 at -110.
2. Enter the SGP odds offered by your sportsbook: For example, the book might price this three-leg SGP at +400.
3. Add your stake: How much you plan to wager on the SGP.
4. See the results: The calculator shows you the payout if you win, the implied probability, the fair independent parlay odds, and the vig differential.

The vig differential is the gap between what the parlay would pay if the legs were independent and what the sportsbook is actually offering. That gap is the correlation tax: the extra edge the book is taking because your legs are related to each other.

What Is a Same Game Parlay?

How Same Game Parlays Work (In One Minute)

A same game parlay (SGP) is a parlay bet where all the legs come from the same game or event. Instead of combining picks from different games like a traditional parlay, you stack multiple selections from one matchup: a team spread, a player prop, a game total, and so on.

For example, you might build an NFL same game parlay that combines:

• Kansas City Chiefs to cover -7.5
• Patrick Mahomes over 275.5 passing yards
• Travis Kelce anytime touchdown
• Game total over 48.5 points

All four legs come from the same Chiefs game. The sportsbook prices that package as one bet. If all four legs win, you win the parlay. If any one leg loses, the entire ticket loses.

The key difference between a same game parlay and a traditional parlay is that same game parlay legs are often correlated. If Mahomes throws for big yardage, Kelce is more likely to score, and the Chiefs are more likely to cover and push the total over. Because of that correlation, sportsbooks adjust the combined odds downward compared to what an independent parlay would pay.

Why Sportsbooks Promote SGPs So Heavily

Sportsbooks love same game parlays because they carry much higher house edges than straight bets or traditional parlays. Public data and operator disclosures suggest that SGP hold rates can exceed 20% on some tickets, compared to around 5% on typical straight bets.

The combination of correlation tax, opaque pricing, and the excitement of building a narrative around one game makes SGPs one of the most profitable bet types for operators. They heavily promote SGPs with featured parlays, boosts, and insurance offers to drive volume.

For bettors, that means same game parlays should be treated as entertainment products with high variance and high costs, not as a core betting strategy. For more on the fundamentals of SGPs, see our Same Game Parlay Explained Guide.

How the Same Game Parlay Calculator Works (Odds, Payouts & Math)

Step-by-Step: From American Odds to Parlay Odds

To understand how the calculator works, it helps to understand the basic math behind parlay odds.

In a traditional parlay with independent legs, you calculate the combined odds by multiplying the individual probabilities together.

Example for illustration only, not betting advice:

• Leg 1: -110 (implied probability roughly 52.4%)
• Leg 2: -110 (implied probability roughly 52.4%)
• Leg 3: -110 (implied probability roughly 52.4%)

Step 1: Convert American odds to decimal odds

-110 in American odds is 1.909 in decimal odds.

Step 2: Multiply the decimal odds together

1.909 × 1.909 × 1.909 = roughly 6.95

Step 3: Convert back to American odds

Decimal odds of 6.95 correspond to American odds of roughly +595.

So a traditional three-leg parlay with independent legs each at -110 would pay around +595.

Independent Parlay Odds vs Same Game Parlay Odds

The calculation above assumes the legs are independent: the outcome of one leg does not affect the outcome of another. In a same game parlay, that assumption breaks down.

When you combine Patrick Mahomes over passing yards, Travis Kelce over receiving yards, and the Chiefs team total over from the same game, those outcomes are positively correlated. If Mahomes throws for big yardage, Kelce is more likely to have a big receiving game, and the Chiefs are more likely to score points.

Because of that positive correlation, the true combined probability of all three legs winning is higher than the naive independent calculation suggests. If the true combined probability is higher, the fair odds should be lower.

The sportsbook applies a correlation discount to reflect that dependency. For example, the book might price this three-leg SGP at +400 instead of +595. The gap between +595 (independent) and +400 (SGP) is the correlation tax.

Our same game parlay calculator shows you both numbers: what the parlay would pay if the legs were independent, and what the sportsbook is actually offering. That comparison helps you see how much extra edge the book is taking because of correlation.

What This Calculator Shows You (and What It Doesn't)

This calculator shows you:

• Payout: What you will win if the SGP hits, based on your stake and the sportsbook's offered odds.
• Implied probability: The probability implied by the sportsbook's odds.
• Fair independent parlay odds: What the parlay would pay if the legs were from different games and independent.
• Vig differential: The gap between the independent price and the SGP price, which represents the correlation tax and extra vig.

This calculator does not:

• Predict the sportsbook's proprietary pricing: Each book uses its own correlation model, and the calculator cannot reverse-engineer that.
• Guarantee profit or value: Seeing the vig differential does not mean the bet is good. It just shows you what you are paying.
• Tell you which legs to bet: The calculator is a tool for understanding, not for picking winners.

For a deeper dive into how correlation affects SGP pricing, see our Same Game Parlay Correlation Guide.

Value, Risk & EV: What This Calculator Can (and Can't) Tell You

Implied Probability and Fair Odds

Implied probability is the probability suggested by the odds offered by the sportsbook. For example, American odds of +400 correspond to an implied probability of 20% (calculated as 100 / (400 + 100)).

The calculator shows you the implied probability of the sportsbook's SGP odds and the fair probability if the legs were independent. The gap between those two numbers is a rough proxy for how much correlation tax and vig the book is applying.

Fair odds are the odds that would correspond to the true probability of the outcome, with no vig. In practice, it is very hard to know the true probability of a correlated same game parlay, which is why fair odds are only an estimate based on independent leg probabilities.

Vig and the Hidden Cost of Same Game Parlays

Vig (short for vigorish) is the house edge: the extra margin the sportsbook builds into the odds to ensure they make a profit over time.

In same game parlays, the vig is much higher than in straight bets because of the correlation tax. Small differences in odds can translate into large differences in expected value.

Example for illustration only:

• Independent three-leg parlay odds: +595
• Sportsbook's SGP odds: +400
• Vig differential: 195 points

That 195-point gap represents roughly a 33% reduction in payout. On a $100 bet, that is the difference between winning $595 and winning $400, a $195 reduction in potential profit.

The higher the vig differential, the more the sportsbook believes the legs are correlated and the more extra edge they are taking.

Why Even "Smart" Parlays Are Usually Negative EV

Expected value (EV) measures whether a bet is profitable over the long run. A positive-EV bet (+EV) would make money on average if repeated thousands of times. A negative-EV bet (-EV) would lose money on average.

Most same game parlays are heavily negative-EV because of the combination of correlation tax and standard vig. Even if you are selective, disciplined, and use this calculator to find the best available pricing, SGPs are structurally expensive.

That does not mean you should never bet same game parlays. It does mean you should approach them with realistic expectations and treat them as entertainment, not as a path to long-term profit.

Quick Take: This tool helps you understand risk. It does not turn parlays into guaranteed profits.

Same Game Parlay vs Regular Parlay

One of the most common questions about same game parlays is: how are they different from regular parlays?

Feature	Regular Parlay	Same Game Parlay
Leg Source	Multiple different games or events	All legs from the same game
Independence	Legs are mostly independent	Legs often correlated
Pricing Method	Multiply individual leg odds together	Adjusted downward for correlation
Typical Hold	Standard vig, around 4-5%	Much higher, often 15-25% or more
Use Cases	Combining picks across a slate	Building a narrative around one game
Risk Profile	High variance, moderate vig	High variance, high vig

When a regular parlay might make more sense:

• When your picks are from different games or events
• When you want to avoid the extra correlation tax
• When you have strong opinions on multiple independent outcomes

When a same game parlay might make sense:

• When you have a strong read on a specific game script (for example, a high-scoring shootout)
• When you want to lean into one strong opinion with multiple related legs
• When you are treating it as entertainment and keeping stakes small

For a traditional parlay calculator that treats all legs as independent, see our Parlay Betting Guide.

Other Same Game Parlay Tools & Why This Calculator Is Different

What Most Parlay Calculators Do

Most parlay calculators on the market are designed for traditional parlays with independent legs. They multiply the individual odds together, show you the payout, and that is it. They do not account for correlation, and they do not show you the vig differential or fair odds.

If you use a standard parlay calculator for a same game parlay, you will get a misleading result. The calculator will tell you what the parlay would pay if the legs were independent, which is almost always higher than what the sportsbook actually offers for an SGP.

What Advanced SGP Tools Offer (and Usually Paywall)

Some advanced tools and platforms offer more sophisticated SGP analysis, including expected value calculators, no-vig fair odds estimators, and hedging/promo optimization features.

These tools are useful for experienced bettors and sharp players, but they are often paywalled and can have complex interfaces that are intimidating for casual users.

Our Approach: Free, Transparent, Built Around Value and Risk

Our same game parlay calculator is free, transparent, and designed for all levels of bettors. It shows you:

• The payout and implied probability
• The fair independent parlay odds for comparison
• The vig differential so you can see the correlation tax

It also integrates responsible gambling messaging throughout, because we believe transparency includes being honest about the high cost and high risk of same game parlays.

How to Use This Calculator in Your Same Game Parlay Strategy (Without Chasing)

Building Smarter SGPs (If You're Going to Bet Anyway)

If you choose to bet same game parlays, this calculator can help you build smarter tickets:

• Keep leg counts low: Two to four legs is usually the sweet spot. The more legs you add, the steeper the correlation tax and the lower your probability of winning.
• Build around a clear game script: Ask yourself: what is the likely flow of this game? Your SGP legs should support that narrative.
• Line shop for the best price: Build the same SGP at multiple sportsbooks and use the calculator to compare the vig differential. Even a 50-point difference in odds can add significant value over time.

Setting Limits Before You Build Your SGP

Before you place any same game parlay, decide in advance:

• How much you are willing to risk: Set a firm dollar limit and do not exceed it, even if the ticket looks exciting.
• How many SGPs you will bet in a week or month: Limit frequency to avoid turning SGPs into a habitual, high-volume bet type.
• What your acceptable loss is: Assume the ticket will lose and make sure you are comfortable with that outcome.

Most regulated US sportsbooks offer deposit limits, loss limits, and time-outs in your account settings. Use these tools proactively to help you stay in control.

Red Flags: When the Calculator Shows the Odds Are Stacked Against You

Use the calculator to identify when a same game parlay is particularly expensive:

• Vig differential above 200 points: If the independent parlay would pay +600 but the SGP pays +400 or less, that is a huge correlation tax.
• Implied probability above 30% for a four-leg parlay: If the sportsbook is pricing your four-leg SGP like it has a 30% or 40% chance of winning, they believe the legs are very tightly correlated.
• Book-to-book differences of 100+ points: If the same SGP is priced at +350 at one book and +450 at another, you are leaving significant value on the table if you do not line shop.

When you see these red flags, it is a sign to either skip the bet, reduce your stake, or look for better pricing elsewhere.

Using the Calculator to Plan Hedges & Promo Plays (For Advanced Users)

Second-Chance Parlays, Insurance and Boosts

Many sportsbooks offer promotions specifically for same game parlays:

• Profit boosts: Increase the payout on a qualifying SGP by 10%, 20%, 50% or more.
• One-leg insurance: Refund your stake if exactly one leg loses (subject to terms and conditions).
• Second-chance bets: Get a bonus bet refund if your SGP loses.

The calculator can help you evaluate these promos by showing you the effective vig after the boost or insurance is applied. For example, if a 50% profit boost takes your SGP from +400 to +600, you can use the calculator to see if that moves the bet closer to neutral EV.

Always read the terms carefully. Most promos come with caps, restrictions, and eligibility requirements that limit their real value.

When Hedging Might Make Sense – and When It Doesn't

Hedging a same game parlay means placing a separate bet to reduce your risk or lock in a guaranteed profit. For example, if most of your SGP legs have already won and you have one leg left, you might hedge by betting the opposite side of that final leg.

Hedging is complex and requires careful math. The calculator can show you the payouts and probabilities, but it cannot tell you whether a hedge is the right decision for your specific situation.

In general, hedging makes more sense when:

• You are already in a profitable position and want to reduce variance
• You have access to favorable lines or promotions on the hedge side
• You have a clear plan for what to do with the guaranteed outcome

Hedging is less useful when:

• You are chasing losses or trying to "get even"
• The hedge costs eat up most or all of your potential profit
• You are hedging emotionally rather than strategically

Real-World Examples: NFL, NBA & MLB Same Game Parlays

NFL Same Game Parlay Example

Game: Kansas City Chiefs vs. Los Angeles Chargers

Your legs:

• Patrick Mahomes over 285.5 passing yards at -110
• Travis Kelce over 75.5 receiving yards at -110
• Game total over 52.5 points at -110

Independent parlay odds: +595

Sportsbook SGP odds: +400

Vig differential: 195 points (roughly 33% reduction)

Analysis: These three legs are highly positively correlated. If the game is high-scoring and Mahomes throws for big yardage, Kelce is likely to have a big receiving game. The sportsbook applies a steep correlation tax to reflect that dependency.

What the calculator shows: On a $100 bet, the independent parlay would return $595 in profit, but the SGP returns $400 in profit. The 195-point gap is the correlation tax.

NBA Same Game Parlay Example

Game: Los Angeles Lakers vs. Boston Celtics

Your legs:

• LeBron James over 27.5 points at -110
• LeBron James over 7.5 assists at -110
• Lakers team total over 112.5 points at -110

Independent parlay odds: +595

Sportsbook SGP odds: +420

Vig differential: 175 points (roughly 29% reduction)

Analysis: These three legs are positively correlated. If LeBron has a big scoring and playmaking night, the Lakers are more likely to hit their team total. The correlation tax is slightly lower than the NFL example, but still significant.

What the calculator shows: On a $100 bet, you are giving up $175 in potential profit compared to the independent parlay price.

MLB Same Game Parlay Example

Game: New York Yankees vs. Boston Red Sox

Your legs:

• Aaron Judge home run at +250
• Yankees team total over 4.5 runs at -120
• Yankees to win at -150

Independent parlay odds: Roughly +850

Sportsbook SGP odds: +550

Vig differential: 300 points (roughly 35% reduction)

Analysis: If Judge hits a home run, the Yankees are much more likely to score runs and win the game. This is a tightly correlated stack, and the sportsbook applies a very steep correlation tax.

What the calculator shows: On a $100 bet, the correlation tax costs you $300 in potential profit.

Responsible Same Game Parlay Betting

Same game parlays are high-variance bets with house edges significantly higher than straight bets or traditional parlays. Even if you use this calculator and bet selectively, SGPs should represent only a small slice of your overall betting activity.

Key responsible gambling principles for SGPs:

• Set clear limits before you start: Decide how much of your bankroll you are willing to risk on SGPs in a week or month, and stick to that number.
• Keep stakes small: Bet no more than 1 to 2% of your bankroll on any single SGP.
• Avoid chasing losses: If you lose several SGPs in a row, do not increase your stakes or bet more frequently to try to get even.
• Use sportsbook tools: Most regulated US operators offer deposit limits, loss limits, and time-outs. Use these proactively.
• Treat SGPs as entertainment: Do not bet on same game parlays with money you need for bills, savings, or other essentials.

If you feel that betting is no longer fun, or if it is starting to affect your work, relationships, or finances, reach out for help immediately:

• National Problem Gambling Helpline: 1-800-522-4700
• NCPG Chat: ncpgambling.org/chat
• State-specific resources: Check your state gaming regulator's website for local support

Where You Can Bet Same Game Parlays: Legal & State Info

Same game parlays are typically available wherever online sports betting is legal and regulated in the US. However, availability of specific markets and prop types can vary by state and operator.

As of 2025, online sports betting is legal in more than 30 US states, but product offerings differ by jurisdiction. Some states restrict certain prop types or same game parlay features due to local regulations.

Before you bet, always check:

• Your state's legal status: Confirm that online sports betting is legal in your state.
• Operator availability: Not all sportsbooks operate in all legal states.
• Market restrictions: Some states restrict player props or certain bet types.

All bets must be placed by users who are 21 or older (or 18+ in certain states) and physically located in a legal jurisdiction. Geolocation and identity verification are required.

Availability of same game parlays and specific markets depends on your state and sportsbook. Always check local laws and operator terms before betting.

FAQ: Same Game Parlay Calculators & Odds

Can I use a regular parlay calculator for a same game parlay?

No, you should not use a regular parlay calculator for a same game parlay. Standard parlay calculators assume the legs are independent and multiply the individual odds together. Same game parlays have correlated legs, which means the sportsbook applies a correlation discount. If you use a regular calculator, you will get a misleading result that is higher than what the book actually offers.

Why are my SGP odds lower than a normal parlay?

Your same game parlay odds are lower than a normal parlay because of correlation. When outcomes from the same game are related (for example, a QB passing yards over and his top receiver receiving yards over), the sportsbook reduces the combined payout to reflect that dependency. That reduction is called the correlation tax.

Is there a free same game parlay calculator?

Yes, the calculator on this page is free and designed specifically for same game parlays. It shows you the payout, implied probability, fair independent parlay odds, and vig differential. No sign-up or payment required.

What is correlation in same game parlays?

Correlation in same game parlays describes the statistical relationship between bet legs from the same game. Positive correlation means two outcomes are more likely to happen together (for example, QB passing yards over and team total over). Negative correlation means two outcomes are less likely to happen together (for example, large spread and game total under). Sportsbooks adjust SGP odds based on correlation.

How many legs should a same game parlay have?

Most disciplined bettors keep same game parlays to two to four legs. That range gives you enough structure to lean into a game narrative without turning the bet into a low-probability lottery ticket. The more legs you add, the harder it is to win and the steeper the correlation tax becomes.

Are SGPs a good bet?

Same game parlays are high-variance, high-margin bets that are structurally expensive. Most SGPs are negative expected value even if you are selective. They can be fun and entertaining, but they should be treated as entertainment, not as a core betting strategy or path to long-term profit.

Conclusion & Next Steps

This same game parlay calculator is designed to help you make more informed decisions about SGPs by showing you the payout, the vig, and the correlation tax in plain numbers. It is not a magic tool that turns parlays into good bets, but it can help you understand what you are paying for and identify when a sportsbook is offering particularly poor pricing.

Before you place your next same game parlay:

1. Use this calculator to see the vig differential
2. Line shop at multiple sportsbooks to find the best available odds
3. Set firm limits on your stake and frequency
4. Treat SGPs as entertainment, not as a path to profit

For more detailed strategy guidance, see our Same Game Parlay Strategy Guide. For an in-depth explanation of how correlation works, see our Same Game Parlay Correlation Guide.

Sports betting should stay optional and affordable. If you feel that your betting is out of control or affecting your life negatively, reach out for help immediately.