Shots on target doubles, trebles and accas

Player shots-on-target stacks — two, three, or six players each to land 1+ on target — have become the default modern bet builder, with 2+ on target the spicier line for a single volume shooter. The legs are only mildly correlated (an open game lifts shot counts at both ends, but one player’s radar says little about another’s), which makes these builders behave differently from cards or goals clusters: the maths is dominated not by correlation but by the player-prop margin stacking up leg after leg. That is exactly what this calculator makes visible.

Bet Builder Engine

betcalc365.com/bet-builder-calculator

Why your bet builder isn’t the legs multiplied

Legs in the same match move together — a team winning, scoring over 2.5 and both teams scoring are correlated, so the true price is lower than multiplying the odds suggests. This tool models that correlation, shows the fair odds, and splits the gap to the bookmaker’s price into correlation versus margin.

Estimate, not a guarantee. Correlations are modelled priors; de-vig uses market-type margin estimates. A transparency tool, not a tip.

Your legs (2)

Bookmaker’s bet builder price (optional — unlocks EV)

Try a scenario

Why your odds differ from 2.20

Multiplying the legs gives 2.20. Our model prices the builder at 2.63 because the legs are positively correlated (+3% joint-probability impact) and each leg already carries the bookmaker’s margin. The bookmaker’s price is 2.10, an implied margin of 20.2% on the combination.

Correlation between your legs

Home Player — 1+ Shot on Target + Away Player — 1+ Shot on Targetρ +0.08
An open, end-to-end game lifts shot counts at both ends — a mild positive link between players on opposite sides.

Correlation map

1Home Player — 1+ Shot on Target
2Away Player — 1+ Shot on Target

The gap between the headline price and the fair price is the bookmaker’s margin in a form most punters never see. Learn the foundations in expected value and overround.

Your bet builder

Correlation matrix

Fair odds (our model)

2.63

vs 2.20 multiplying the legs

Expected valueMarket price

-20.2%

at the bookmaker’s 2.10

Naive (multiply)2.20

Fair (our model)2.63

Bookie SGP2.10

Correlation impact: +3%
Implied SGP margin: 20.2%
Avg leg margin stripped: 11.0%

Why home player — 1+ shot on target and away player — 1+ shot on target are correlated

An open, end-to-end game lifts shot counts at both ends — a mild positive link between players on opposite sides. In our structural model the link is mild positive (ρ = 0.08). Because the legs tend to land together, the true probability of the builder is higher than multiplying the two prices implies — so the fair odds are shorter than the naive product. Bookmakers price this in; the question is whether they have priced it fairly or taken extra margin on top.

A worked example

Take home player — 1+ shot on target at 1.44 and away player — 1+ shot on target at 1.53 — the prices pre-loaded above. Multiplied together they suggest 2.20. These legs aren't derived from the final scoreline, so our engine de-vigs each leg and prices the pair through the correlation engine: fair odds of 2.63, about 3% more likely than independence assumes. Against an example bookmaker quote of 2.10, the calculator shows the implied margin and expected value instantly — replace any number with your own match's prices and it reprices live.

The two forces inside the price

Two opposing forces set the fair price of any builder, and seeing them separately is the whole trick.

Margin stripping pushes the price out. The quoted legs aren't probabilities — each carries the bookmaker's margin, about 11.0% per leg on these markets. De-vig both legs and multiply the honest probabilities and you get 2.71, not 2.20 — the multiplied number was never a fair price; it's two margins compounded into each other.

Correlation pulls it back in. These legs lean together, so the joint outcome is about 3% more likely than independence implies — pulling the price in from 2.71 to 2.63.

Here, margin wins: the correlation is too mild to give back what the de-vig takes out, so the fair price 2.63 sits above the multiplied 2.20. On this combination the multiplied number isn't a target you're missing — it was never the fair price at all.

Check the price, not the story

Every leg you are quoted already contains margin, and the builder price layers more on top — that, not the correlation, is where value quietly disappears. For the full derivation of how this engine prices a builder, read how we price a bet builder. If the mechanics are new to you, start with our cornerstone guide on what overround means for your returns and the expected value glossary entry. Then judge any shots on target double quote with the calculator: value, fair, or below fair.

More bet builder combinations

Scorer + 2+ Shots on Target — Backing the same player to score and land 2+ shots on target is a heavily overlapping stack — a goal IS a shot on target.
Win + Over 2.5 Goals — What should a win and over 2.
Over 2.5 Goals + BTTS — Over 2.
Bet Builder Calculator — build any 2–10 leg combination with correlation-aware fair odds and EV.

Common questions

Why do shots accas pay less than the legs suggest, if the legs are nearly independent?

Margin, compounding. Player shot markets carry the heaviest margin of any mainstream football price — our de-vig prior treats them as roughly 11% per leg. On a six-leg SOT acca that stacks six times over, and unlike correlation (which genuinely changes the probability), margin is purely the price of admission. The calculator separates the two so you can see how much of the gap is real probability and how much is the compounding hold.

Should I use 1+ or 2+ shots on target for an acca?

1+ SOT legs are short (often 1.20–1.50), so stacking six of them builds a price slowly while compounding six legs of margin — the classic high-strike-rate, low-value shape. 2+ SOT legs price longer and are where player judgement (volume shooters, penalty takers, talisman roles) earns more. Either way, load the quoted prices into the calculator and compare the fair odds against the builder quote before deciding the stack is worth it.

What are the fair odds for a shots on target double bet builder?

With typical prices — Home Player — 1+ Shot on Target at 1.44 and Away Player — 1+ Shot on Target at 1.53 — the multiplied (naive) price is 2.20, but the correlation-adjusted fair odds are 2.63. The legs are mild positively correlated, which makes the true combined probability higher than independence implies. Load your own match's prices into the calculator for an exact answer.