plainodds

No-Vig Calculator

Strip the vig. Reveal the fair odds and probabilities underneath a sportsbook's two-sided market.

No-Vig Calculator

Odds format

If you have a take on Side A's real chance, fill this in to see if the book is mispricing it.

Why this matters

What is no-vig pricing?

No-vig odds are what a fair market would price a bet at if the sportsbook took no commission. Strip the book's vig out of both sides and you get the book's actual implied probability for each outcome — useful as a starting point for estimating "true" probability when doing EV math.

The standard method: divide each side's implied probability by the sum of both sides' implied probabilities.

no-vig prob_A = (1/decimal_A) / (1/decimal_A + 1/decimal_B)

How do sharp bettors use this?

Take a sharp book like Pinnacle or Circa, where the lines are tight and the hold is low. Calculate the no-vig probabilities. That's a reasonable approximation of the true win probability for each side.

Then check other sportsbooks. If a soft book has the same side priced at odds that imply a LOWER probability than your sharp-book no-vig estimate, that's a positive expected-value bet. Plug those numbers into the EV calculator to size it.

Hold vs vig — what's the difference?

Same idea, slightly different math. Vig is the per-bet juice (e.g., −110 implies ~4.55% vig per bet). Hold is the book's long-run profit margin on a market — the sum of both sides' implied probabilities minus 100%. A −110/−110 market has about 4.76% hold.

For comparing sportsbooks, hold is the better number — it tells you what edge the book has across the whole market.