Paste the over and under prices on any market. We strip the sportsbook's hold and show you the true fair odds — the price with zero margin. This is the same math Pinnacle-based models use to find mispriced lines and +EV bets.
Sportsbook hold
4.71%
Raw total implied
104.71%
Anything above 0% hold means the book is taking a cut. No-vig odds assume a perfectly efficient market.
Fair Over
Fair price
-1041.958
Fair probability 51.08%
EV at book price:-4.50%
Fair Under
Fair price
+1042.044
Fair probability 48.92%
EV at book price:-4.50%
Try:
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
Frequently asked questions
What is a no-vig calculator?+
A no-vig calculator (also called a devig calculator or fair-odds calculator) removes the sportsbook’s margin (the vig or juice) from a two-sided market and returns the true probability and fair price. Sharp bettors compare this fair price to soft-book lines to find +EV bets.
How accurate are no-vig odds?+
No-vig odds assume the sharpest book has efficiently priced both sides. That is why bettors typically devig prices from a sharp book like Pinnacle and then compare to soft books. Tighter markets (lower hold) produce more reliable fair prices.
What does sportsbook hold mean?+
Hold is the total implied probability above 100%. If the over implies 53% and the under implies 51%, the hold is 4%. Anything above 0% means the book is taking a margin. Sharp markets have hold under 3%; recreational markets often run 5–8%.
Can I use this for player props?+
Yes. Paste the over and under prices for any player prop and the calculator will return the fair line. For DFS books with fixed payouts (PrizePicks 1.84x, Underdog 1.86x), the implied probability is built in — devigging is most useful for sportsbook two-way markets.
What is a +EV bet?+
A bet with positive expected value: your true probability of winning multiplied by the payout exceeds 1. Example: fair probability is 55%, you can bet at 1.91 decimal payout → 0.55 × 1.91 − 1 = +5.05% EV. Long-term, +EV bets win.
Is this calculator really free?+
Yes. No signup, no email, no rate limit. Turtle +EV Labs publishes free betting tools to help bettors learn the math; our paid product is the picks platform that finds these edges automatically across 48 books.
Calculators are free. The Turtle +EV picks platform runs every prop through a sport-specific model and ranks the ones where the line is mispriced. NBA · NHL · MLB · Soccer · Tennis. 48 books.