Free Tool
Vig Calculator
Enter the two sides of any market. We'll show you exactly how much the book is charging you to play.
Vig / hold
4.76%
Standard market
Side A implied52.38%
Side B implied52.38%
Total (overround)104.76%
Reading the vig
A fair two-sided market has implied probabilities summing to 100%. Books bake in extra — the "overround" — so the two sides sum to >100%. The vig is that extra slice. A −110/−110 spread carries 4.5% vig; a sharp Pinnacle market is often 2.0–2.5%; a soft offshore book might charge 6%+ on player props. To break even at −110 you need to win 52.4% — and that 2.4 points above 50/50 is exactly the vig.