A Same Game Parlay (SGP), also called a Bet Builder in the UK and Europe, lets you combine multiple selections from a single sporting event into one wager. Instead of mixing legs from different games, you stack picks from one matchup — for example, a Patrick Mahomes passing yardage prop, the Chiefs moneyline, and the game total over.
Calculating SGP odds is not as simple as multiplying the individual prices together. Because the legs come from the same event, they are usually correlated — the outcome of one influences the probability of the others. Sportsbooks adjust the combined price to reflect this. Our Same Game Parlay Calculator lets you build a virtual slip across any sport (NFL, NBA, MLB, NHL, tennis, soccer) and instantly estimate both the standard parlay payout and an adjusted SGP figure.
SGP & Parlay Builder
How to Use the SGP Calculator
The tool mimics a sportsbook betting slip so you can experiment with combinations before committing real money.
- Add Selections: Click “Add Selection” for each leg of your bet. Enter a name (optional) and the decimal odds.
- Enter Stake: Type the amount you plan to wager in the “Stake Amount” box.
- Choose Your Mode:
- Standard Mode (Toggle OFF): Use this for accumulators across different games (e.g., Chiefs moneyline + Lakers moneyline + Djokovic to win). Decimal odds are multiplied directly.
- Same Game Parlay Mode (Toggle ON): Use this when all selections come from the same match. The calculator applies a simplified reduction to approximate how a bookmaker prices correlation.
- Check Returns: Total Odds and Potential Return update instantly.
Standard Parlay vs Same Game Parlay: The Core Difference
| Bet Type | Legs Come From | Odds Calculation | Main Risk |
|---|---|---|---|
| Standard parlay | Different games or unrelated events | Decimal odds are multiplied | Every leg must win; legs are independent |
| Same Game Parlay | One game or match | Bookmaker adjusts for correlation | Final price often well below the raw multiplied figure |
Why SGP Odds Differ From a Multiplied Parlay
The most common question bettors ask: “Why is my payout different when I combine bets from the same game?”
Independent Parlay (Different Games)
You bet on three separate events with no link between them:
- Real Madrid Moneyline (1.50)
- Kansas City Chiefs Moneyline (1.40)
- Novak Djokovic to Win (1.80)
Calculation: 1.50 × 1.40 × 1.80 = 3.78 Total Odds. Because the events are independent, simple multiplication works.
Same Game Parlay (One Game)
Now build a slip from a single Liverpool match:
- Liverpool to Win (1.50)
- Liverpool Over 1.5 Team Goals (1.20)
Multiplying gives 1.80, but treating the legs as independent overstates the combined odds. If Liverpool are strong enough to win, their chance of scoring two or more goals is higher than the standalone market implies. The legs are positively correlated, and a bookmaker prices that in by reducing the combined odds — typically to somewhere around 1.50–1.65 depending on the operator.
A Note on Negative Correlation
Not all SGPs reduce odds. Legs that work against each other — for example “Team A Moneyline” combined with “Under 2.0 Total Goals” — are negatively correlated. In those cases a real sportsbook may offer odds higher than the independent multiplication, because the joint probability is lower than the product of the two singles. This calculator does not model negative correlation, so for those combinations the SGP estimate is conservative. Always check the actual price displayed by your sportsbook.
SGP Examples Across Sports
NFL Same Game Parlay
A common NFL SGP combines a quarterback prop with a team result and a game total — for example, Patrick Mahomes Over 275.5 passing yards + Chiefs Moneyline + Game Total Over 48.5. Because a quarterback hitting his yardage usually means his team is scoring, the legs are positively correlated and the SGP price is materially lower than the multiplied total.
NBA Same Game Parlay
NBA SGPs typically pair a star player’s points or rebounds prop with the team spread or moneyline. A high individual scoring night and a team win tend to occur together, so the bookmaker adjusts the combined price down.
MLB Same Game Parlay
MLB SGPs are often built around starting-pitcher strikeout props plus the run line or game total. Strikeout-heavy outings frequently coincide with low-scoring games, which creates correlation between the strikeout over and the game total under.
NHL Same Game Parlay
Hockey SGPs commonly combine a player’s shots-on-goal prop with the team puckline or anytime goal scorer markets. Shots-on-goal volume tends to track with offensive opportunity, so the legs share underlying drivers.
How This Calculator Estimates SGP Odds
The tool first multiplies all selected decimal odds as if every leg were independent. When SGP Mode is enabled, it then applies a simplified reduction to approximate the correlation discount a sportsbook would charge.
This is a screening estimate, not a replication of any operator’s pricing model. Real sportsbooks use proprietary methods — Gaussian copulas, empirical frequency tables, market-derived correlation matrices — that vary by sport, market, and even individual matchup. Use the calculator to sanity-check the price your sportsbook is showing, not to predict it.
When This Calculator Is Most Useful
- Checking whether the SGP price your sportsbook displays looks reasonable or unusually steep.
- Comparing the raw multiplied parlay price with an estimated SGP price to see the implicit correlation cost.
- Understanding why bookmakers do not simply multiply same-game legs.
- Testing different stake levels and payout scenarios before placing a real wager.
Calculator Limitations
- The SGP estimate uses a fixed reduction. Real-world correlation varies sharply by leg combination.
- Estimates are reasonable for positively correlated legs (winner + over, QB yards + team win) and conservative (too low) for negatively correlated combinations.
- The tool cannot account for bookmaker-specific blocks: some operators reject combinations they consider too tightly correlated.
- Prices for the same SGP vary significantly between sportsbooks. Line shopping matters more for SGPs than for single bets.
Frequently Asked Questions
What is a Same Game Parlay (SGP)?
An SGP is a bet that combines multiple selections from a single sporting event into one wager. All selections must win for the bet to pay out. It is also known as a “Bet Builder” in the UK and Europe or a “One Game Parlay” at some US books.
Is a Same Game Parlay calculator exact?
No. It can estimate how correlation changes the payout, but it cannot reproduce a sportsbook’s internal model. Always treat the output as a sanity check against the actual price displayed in your betting slip.
Why are SGP odds usually lower than standard parlay odds?
Because most popular SGP combinations are positively correlated. If you bet on a quarterback to throw three touchdowns and his team to win, the events support each other — both are more likely to happen together than independent multiplication suggests. Bookmakers reduce the combined payout to reflect this. For negatively correlated legs the opposite can apply, and odds may be higher than the independent calculation.
How do you calculate standard parlay odds?
Convert every leg to decimal format, multiply the decimal prices together to get the total odds, then multiply by your stake to get the total return. For three legs at 1.50, 1.40, and 1.80: 1.50 × 1.40 × 1.80 = 3.78. A $10 stake returns $37.80.
Why do sportsbooks block some Bet Builder combinations?
Some legs are logically impossible or so tightly connected that pricing them fairly is impractical — for example, “Under 0.5 Total Goals” combined with “Any Player to Score.” Sportsbooks usually reject those combinations or display them as unavailable in the bet builder interface.
Can I combine multiple Same Game Parlays?
Yes — this is often called an SGPx, Bet Builder Plus, or Same Game Parlay Plus. You build an SGP for Match A, another for Match B, and combine them into a single accumulator. To estimate this in our calculator, turn SGP Mode OFF and enter the final SGP odds for each match as a single selection. Note that some sportsbooks settle SGPx differently from standard parlays — check your operator’s rules.
Are Same Game Parlays good value?
Generally, no. SGPs are high-margin products for sportsbooks, with effective hold rates often well above what you face on single bets or carefully priced standard parlays. They can be entertaining, but the implicit cost is higher. Mitigate this by line shopping across operators and keeping the number of legs small.
Responsible gambling notice: This calculator is for educational and entertainment purposes only. It does not guarantee any sportsbook payout, and same game parlays are high-margin products that typically favour the operator. Never wager more than you can afford to lose. If gambling stops being fun, stop. Help is available — visit BeGambleAware (UK) or call 1-800-GAMBLER (US) for confidential support.