Why no-vig odds matter
Every price at a sportsbook includes a margin for the house. If you add the implied probability of both sides of a market, the total is always more than 100% — that excess is the hold (or vig, juice). To figure out what the true fair odds are, you normalize both sides back to 100% total probability. That's what this calculator does.
Sharp bettors compare a book's price against the no-vig price at a sharp book like Pinnacle. When a soft book is offering a price better than sharp no-vig, that's a +EV bet. The Turtle +EV model runs this comparison on every player prop, every 5 minutes, across 48 books.
- Hold < 3% — tight market, sharp book
- Hold 3-6% — standard sportsbook market
- Hold > 6% — soft book or illiquid market; expect wider arbs
What Is a Devig Calculator?
A devig calculator is the same tool by another name — "devigging" is the act of stripping the vig out of a sportsbook's pricing to expose the true probability. Sharp bettors use a devig calculator before placing any bet because the only price that matters is the fair price; everything else is the book's margin you're paying.
The math is identical to what this page already does: enter both sides of a two-way market, and the calculator normalizes the implied probabilities back to 100% to produce the no-vig (devigged) price. Whether you call it a no-vig calculator, devig calculator, or fair-odds calculator, the output is the same — the price the bet would carry if the book took zero margin.
Fair Odds Calculator: Comparing Book Prices to True Probability
Once you have the fair odds (the no-vig output from a sharp book like Pinnacle), every other sportsbook becomes a candidate for +EV betting. If a soft book is offering a price better than the fair price you derived, that gap is your edge. This is exactly the workflow the Turtle +EV model automates across 48 sportsbooks every 2 minutes — and it's the foundation of every profitable +EV system.
Once you've found the fair price, size your bet with the Kelly Criterion Calculator, then verify your slip composition with the Parlay Calculator if combining multiple legs.