No-Vig Fair Odds Calculator

Free Vault membership gives you access to PromoGrind and sync across Studio tools. Educational math tool only. Must be 21+ where legal. Winnings may be taxable. If you or someone you know has a gambling problem, call 1-800-GAMBLER.

Strip out the sportsbook's margin to see the true implied probability behind any betting line — essential for identifying value and comparing books accurately.

Use the calculator →

What Is Vig (Juice)?

Vig — short for vigorish — is the bookmaker's built-in profit margin. Rather than paying true odds, sportsbooks shade each side of a market slightly in their favor. The combined implied probabilities of all outcomes always add up to more than 100%, with the excess representing the house edge. The vig is how sportsbooks profit regardless of which side wins.

What a Typical 4–6% Vig Looks Like

The most common US sports betting line is -110 / -110 on spread and totals markets. Each side carries an implied probability of 52.38%, summing to 104.76% — meaning the book has a 4.76% margin baked in. On more popular markets or major books, vig can reach 6–8%. Pinnacle and sharp books often offer as low as 2–3%.

Why Removing Vig Reveals True Probability

Once you remove the vig, the remaining fair implied probabilities sum to exactly 100% and represent the market's honest assessment of each outcome. This is your baseline for finding value bets: if your own estimated probability for an outcome is higher than the fair implied probability, you have a positive expected value (+EV) bet. The no-vig calculator makes this comparison instant.

Using Fair Odds to Find Value

Compare the no-vig fair odds across multiple sportsbooks. Discrepancies between books point to arbitrage or +EV opportunities. Pair the No-Vig calculator with PromoGrind's EV calculator to quantify the exact expected profit per dollar wagered on any bet you are considering.

Frequently Asked Questions

What is vig in sports betting?
Vig is the commission a sportsbook charges by setting odds worse than the true probability. On -110/-110 lines, the total implied probability is ~104.8% — the extra 4.8% is the vig. It is sometimes called juice, margin, or the overround.
How do I calculate no-vig odds?
Convert each side's American odds to implied probability, add them together, then divide each individual probability by the total. The result is the fair no-vig probability for each outcome. Enter any line into the PromoGrind calculator and it will do this instantly.
What is a fair implied probability?
Fair implied probability is each outcome's true estimated likelihood after the bookmaker's margin is stripped out. All fair probabilities in a market sum to 100%. It is used as the benchmark for spotting value — if you believe an outcome is more likely than the fair probability, the bet has positive expected value.

Core calculators are available now with a free Vault membership. Live scanning, AI help, and other backend-dependent surfaces remain in beta until their services are activated.