Fair odds calculator

Strip the bookmaker margin out of a 2-way or 3-way market and reveal the true implied probability.

No-vig fair odds
Bookmaker margin-1.10%
Odds A 2.10 fair 2.077 48.15%
Odds B 1.95 fair 1.929 51.85%

How it works

Fair probability = inverse-odds / sum-of-inverse-odds. Use it as the "true" probability for EV calculations when no sharp anchor (Polymarket, Pinnacle) is available.

Step by step

  1. Enter the bookmaker's odds, For all outcomes of the same market.
  2. Calculate, See implied probabilities and fair (margin-stripped) odds.

FAQ

Is the margin-stripped price the same as fair?

It's an approximation. The margin is rarely split evenly across outcomes, books shade favourites, so the fair-margin price is biased toward favourites. For sharp work, use Polymarket or a sharp book.