Add up the implied probabilities of both sides of any market and you get more than 100%. That excess is the vig — the sportsbook's built-in margin — and the hold is the cut of balanced action the book expects to keep. A standard −110/−110 spread carries a 4.5% hold; player props often run double that.
Enter both sides of any market to see exactly what you are being charged, plus the no-vig "fair" probabilities of each side. Lower hold means more of your edge survives — it is the sharpest reason to shop lines across books.
