Strip the bookmaker margin (vig) from a 2-way or multi-way market to reveal fair no-vig odds and true implied probabilities for each outcome.
Enter one price per outcome to reveal the fair, margin-free odds.
Pure math only. Not financial advice; no real-money handling.
About this tool
The No-Vig / Fair Odds Calculator removes the bookmaker's built-in margin so you can see the true, fair price of each outcome in a market. Every quoted price has a raw implied probability qᵢ = 1/dᵢ, and because the book charges a margin these add up to more than 100%. That total, the overround, is Σ qᵢ. The tool normalizes proportionally: the fair probability of each outcome is pᵢ = qᵢ / overround, so the fair probabilities sum to exactly 100%.
From each fair probability it derives the fair no-vig odds, 1/pᵢ (also shown in American form), which is the price you would need to make the market break even. It works for a two-way moneyline as well as three-way or larger markets — just enter one price per outcome. For a −110/−110 two-way market both raw probabilities are 52.38%, summing to a 104.76% overround; after proportional de-vigging each fair probability is 50.0% with fair odds of 2.00 (+100).
All of this runs locally in your browser and nothing is uploaded. It uses the standard proportional (multiplicative) normalization method. This is a pure arithmetic tool: not financial or betting advice, and no real money is handled.
Frequently asked questions
How do you remove the vig from odds?
Convert each price to its implied probability qᵢ = 1/decimal odds, sum them to get the overround, then divide each by that sum: fair pᵢ = qᵢ / Σq. The fair no-vig odds are 1/pᵢ. This proportional method rescales the probabilities to total exactly 100%.
What is the overround?
The overround is the sum of every outcome's raw implied probability. In a fair market it is 100%; the amount above 100% is the bookmaker's margin. For a −110/−110 line it is 104.76%, meaning a 4.76% margin built into the prices.
Does this work for three-way markets?
Yes. Enter one price per outcome — two for a moneyline, three for a 1X2 soccer market, or more. The proportional normalization divides each raw implied probability by the total, so the fair probabilities always sum to 100% no matter how many outcomes.
Is proportional de-vigging the only method?
No — there are alternatives like the Shin and logarithmic (power) methods that distribute the margin differently. This tool uses the standard proportional (multiplicative) approach, which is the most common and works well for roughly balanced markets.