Vig calculator
Estimate the margin built into a betting market. Enter the listed odds, then compare overround, hold, implied probability, and no-vig fair probability.
How far the market total exceeds 100%.
Overround divided by the total implied market.
Sum of listed implied probabilities.
| Outcome | Implied | No-vig fair probability | Fair American |
|---|
Estimate market vig
Choose 2-way or 3-way
Use two outcomes for spreads, totals, and moneylines without a draw. Use three for home-draw-away markets.
Enter listed odds
Use the same odds format for every outcome in the market.
Read overround and hold
The overround shows the amount above 100%; hold estimates that margin as a share of the listed market total.
How vig is estimated
Convert odds to probability
Each listed outcome becomes an implied probability.
Add the market total
Market total = all implied probabilities added together.
Subtract 100%
Overround = market total - 100%. Estimated hold = overround / market total.
Vig calculator questions
What does a vig calculator do?
A vig calculator converts each listed price to implied probability, adds the market total, and estimates how much the total exceeds 100%.
What is overround?
Overround is the amount by which listed implied probabilities add up to more than 100%. It is one way to express sportsbook margin.
What is sportsbook hold?
Hold is commonly estimated as overround divided by the total implied market. It is related to vig, but exact book hold depends on betting volume and outcomes.
Can this calculator handle 3-way vig?
Yes. It supports two-outcome markets and three-outcome markets such as soccer home-draw-away lines.
Go from vig to fair odds
No-vig fair odds calculator
Use the same market to calculate fair odds after removing the margin.
How to calculate vig
Read the step-by-step formula behind overround and no-vig odds.
What is vig in betting?
Understand vig, juice, and overround in plain English.
Vig estimates are educational. They do not prove value, predict outcomes, or make a market safe to bet.