AISportsPlaysDe-Vig Calculator
Enter both sides of a two-way market (like -110/-110, or any moneyline pair) to strip out the sportsbook's built-in margin and see the true, fair probability of each side. No login required.
The book's own posted prices imply a combined 104.8% — that extra 4.8% over 100% is the sportsbook's built-in margin ("the vig"), removed above.
What "de-vigging" means
Every two-way market a sportsbook posts — like a point spread at -110 on both sides — has a built-in margin (often called "the vig" or "the juice"). That's why both sides of an even market are priced at -110 instead of a fair +100/-100: the book is charging a toll on every pick, win or lose. The raw implied probabilities from both sides add up to more than 100% because of it.
How to use it
Enter the posted odds for both sides of the same market — any format works. The tool converts each to its raw implied probability, then normalizes both so they add up to exactly 100%, which is the market's real, vig-free estimate of each side's true chance.
Why it matters
The de-vigged number is the closest thing to "what does the market actually think will happen," separated from "what is the book charging me to take that side." It's the same normalization used to compare a model's own probability estimate against what the market is really saying, instead of comparing against a number that already has a margin baked in.
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