SGM Calculator
Combine 2–4 same game multi legs, see the combined multiplier, and check how much value the bookmaker keeps versus betting the legs as singles.
The combined multiplier assumes your legs are independent and fairly priced. Bookmakers price a same game multi shorter than that product because legs in one game are correlated and they add margin — the gap above is the value you give up versus betting the legs as singles. Positively correlated legs (a team to win and its star to score) are worth more than the multi price implies; the book protects itself by shortening the payout.
How the SGM calculator works
Enter the decimal odds for each leg and the tool multiplies them into a combined price. That product is the fair multi only if the legs are independent and fairly priced — which, in a same game multi, they rarely are.
Add the bookmaker’s quoted SGM price and the calculator shows the gap between the two. That gap is the correlation margin: the value the book keeps by bundling correlated legs and adding its own margin on top.
Why correlation matters
Legs from one game move together. A team winning big makes its forward scoring more likely, so multiplying single-leg odds would over-pay a punter. Bookmakers shorten the SGM to protect against that — and pad the margin further. Typical SGM markets carry a 15–25% margin, which is why they are among the highest-hold bets you can place.
FAQ
- What is a same game multi (SGM)?
A same game multi combines two or more bets from a single match — for example a team to win, a player to score and the total points over a line — into one multi. Because the legs come from the same game, they are often correlated, which is why bookmakers price SGMs differently from a standard multi across separate games.
- Why are SGM odds shorter than multiplying the legs?
Two reasons. First, legs in one game are correlated — if a team wins comfortably, its star scoring becomes more likely — so simply multiplying the single-leg odds would over-pay. Second, bookmakers add extra margin on top. Together these make the quoted SGM price shorter than the product of the legs, which is the correlation margin this calculator shows.
- Are same game multis a good bet?
SGMs carry a high built-in margin — typically 15–25% — so they are among the worst-value markets for systematic bettors. They can still be worth it when your legs are positively correlated and the book has not fully priced that correlation, but stacking many legs usually just compounds the margin. Singles and small, correlated combos preserve more expected value.
- How does Krok Odds find SGM value?
Our SGM picks surface same-game multis that are Platt-calibrated for honest edge and confidence, with empirically-derived per-sport correlation groups adjusting the true multi price instead of naïvely multiplying leg odds. A warning flags when legs are correlated, so you see the real edge rather than the sticker price.
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