No Vig Calculator

Two-way, 3-way / multi, and implied modes

Use two-way mode for standard moneyline or spread prices, 3-way / multi mode for three or more mutually exclusive outcomes, and implied mode when you only have one American price.

Bookmaker overround and vig

When market prices are converted to implied probability, the sum is usually above 100%. That excess is overround (vig) — the bookmaker’s built-in margin.

Normalization / no-vig fair odds (devig)

This calculator divides each outcome’s implied probability by the total implied probability so fair probabilities sum to 100%, then converts those fair probabilities back to American odds.

Fair odds are no-vig / vig-free / normalized market estimates. Devigging removes bookmaker margin from the quoted price; it does not guarantee the true win probability.

When to use fair odds next to Fantasy Forge

Use fair odds to compare market prices before you decide whether a prop price is soft or expensive. Then paste the props you still like into the free PrizePicks or Underdog optimizers to organize combination ideas.

FAQ

What method does this no vig calculator use?

Multiplicative normalization: convert American odds to implied probabilities, divide each by the sum (overround), then convert the normalized probabilities back to American odds.

Can I calculate a 3-way no vig market?

Yes. Switch to 3-way / multi mode, enter three or more American prices for mutually exclusive outcomes, and review fair probabilities and fair odds for each outcome.

Is this the same as a vig-free, fair-odds, or devig calculator?

Yes for this tool’s purpose. Those names describe the same core job: remove bookmaker margin from American odds and show normalized fair probabilities and fair odds.

Is fair probability the true win chance?

No. Fair probability here means a no-vig / normalized market estimate. Markets can still be wrong, and sports outcomes remain uncertain.

Can I use this as an implied probability calculator?

Yes. Switch to Implied probability mode to convert a single American price into market implied probability and decimal odds. That single-price conversion still includes vig when other sides are unknown.