Clean sheet + BTTS No: nearly one bet, priced as two
This is the bet builder equivalent of buying the same thing twice. A home clean sheet means the away side scored zero — which is already one of the two ways BTTS No wins. The only scenario separating the legs is the home side also failing to score while keeping the clean sheet, i.e. 0-0, which satisfies both anyway. The correlation in our model is 0.85, close to the legs being identical, and the fair price reflects that brutally.
Bet Builder Engine
betcalc365.com/bet-builder-calculatorWhy 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.
Enter the match’s main prices. With the 1X2 and Over/Under 2.5 lines the tool fits a match model (expected goals) and prices your builder exactly, instead of the correlation matrix.
Why your odds differ from 4.88
Multiplying the legs gives 4.88. Our model prices the builder at 2.72 because the legs are positively correlated (+106% joint-probability impact) and each leg already carries the bookmaker’s margin. The bookmaker’s price is 3.40, which is 25.1% longer than our fair estimate.
Correlation between your legs
- Home Clean Sheet + BTTS — Noρ +0.85
A home clean sheet means the away side did not score, so BTTS No is nearly implied.
Correlation map
- 1Home Clean Sheet
- 2BTTS — No
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 impact
- +106%
- Implied SGP margin
- −25.1%
- Avg leg margin stripped
- 5.0%
Why home clean sheet and btts — no are correlated
A home clean sheet means the away side did not score, so BTTS No is nearly implied. In our structural model the link is near-identical positive (ρ = 0.85). 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 clean sheet at 2.50 and btts — no at 1.95 — the prices pre-loaded above. Multiplied together they suggest 4.88. Our engine de-vigs each leg, fits a match model to the example match odds in the advanced panel, and prices the joint outcome exactly: fair odds of 2.72, about 106% more likely than independence assumes. (The fitted model expects roughly 1.6–1.0 goals in this example match.) Against an example bookmaker quote of 3.40, the calculator shows the implied margin and expected value instantly — replace any number with your own match's prices and it reprices live.
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 how overround turns into bookmaker profit and the expected value glossary entry. Then judge any clean sheet + btts no quote with the calculator: value, fair, or below fair.
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