What is vig or juice in sports betting?

Vig (short for vigorish) or juice is the commission a sportsbook charges on every bet. It is built into the odds so that, if balanced action comes in on both sides, the book profits regardless of outcome. A standard -110/-110 line on a spread market implies 52.38% on each side — but true probability adds up to only 100%, meaning the overround of 104.76% includes a ~4.5% vig margin.

How do I calculate no-vig odds?

To remove the vig: (1) Convert both moneylines to implied probabilities. For negative odds: |odds| / (|odds| + 100). For positive odds: 100 / (odds + 100). (2) Sum both raw probabilities to get the overround. (3) Divide each raw probability by the overround to get the true (no-vig) probability. (4) Optionally convert true probabilities back to American odds for comparison.

What is a fair bet in sports betting?

A fair bet is one where the implied probability exactly matches the true probability of the event — no vig included. On a fair coin flip, both sides would be offered at +100 (even money). In practice, sportsbooks never offer truly fair lines because they need margin to cover operating costs and profit. Shopping for the best line across multiple books helps minimize the vig you pay.

How much does a typical sportsbook charge in vig?

For standard point spread or total markets, most sportsbooks charge 4%–5% vig — typically expressed as -110 on both sides. Some sharp books (Pinnacle, Circa) offer reduced juice at -105/-105, cutting vig to about 2.4%. High-hold markets like parlays, player props, and futures can carry 8%–20%+ vig. Always check the no-vig price before placing a wager to know exactly what you're paying.

What is the difference between implied probability and true probability?

Implied probability is the win probability that a set of odds suggests if taken at face value — it includes the vig, so the two sides of a market sum to more than 100%. True probability (also called no-vig probability) is what the odds imply after removing the book's margin, so both sides sum to exactly 100%. The difference between the two is how much the vig inflates the book's implied edge.

What is overround in sports betting?

Overround (also called the book percentage or total hold) is the sum of all implied probabilities across a market. On a fair two-outcome market, this would be 100%. A -110/-110 spread market has an overround of 104.76%, meaning the book builds in a 4.76% margin above a fair price. Higher overround = more vig. Our no-vig calculator shows this figure directly so you can evaluate market quality at a glance.

No Vig Calculator — True Odds & Fair Bet

Calculates true odds and removes the bookmaker's vigorish (juice) from any bet — shows true implied probability, fair American odds, and vig percentage.

What Is Vigorish (Vig) and Why Does It Matter?

This no vig calculator removes the bookmaker margin from any moneyline and reveals the true implied probability and fair odds for each side. Every sportsbook charges a vigorish (vig) or juice hidden inside the odds — when you see -110/-110 on a standard NFL spread, each side implies 52.38% win probability, but the overround of 104.76% includes the sportsbook's built-in profit margin.

Removing the vig — also called the "no-vig price" or "fair odds" — tells you what the book actually thinks the true probability of each side is. It is the baseline every sharp bettor uses to evaluate whether a line offers value.

No-Vig Formula Explained

The no-vig calculation is straightforward once you understand implied probability:

Convert odds to implied probability:
- Negative odds (favorites): |odds| ÷ (|odds| + 100) — e.g., -110 → 110/210 = 52.38%
- Positive odds (underdogs): 100 ÷ (odds + 100) — e.g., +130 → 100/230 = 43.48%
Sum both implied probabilities: This is the overround. For -110/-110, it is 104.76%.
Divide each probability by the overround: 52.38% ÷ 104.76% = 50.00%. Both sides become exactly 50/50 — the fair price for a coin flip.

Our calculator performs these steps automatically. You can also input implied probabilities directly if you already have them.

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How Much Does the Book Charge? Vig by Market Type

Not all markets carry the same vig. Here is a rough guide to what you should expect across common bet types:

Point spreads / Totals: 4%–5% vig (typically -110/-110). Reduced-juice books offer -105/-105 (~2.4%).
Moneylines: Varies widely. A -120/+100 moneyline carries about 4.8% vig.
Player props: 6%–12% vig is common; some soft markets exceed 15%.
Futures (e.g., season wins, championship): Often 15%–25% hold, sometimes higher for long-odds markets.
Same-game parlays: 20%+ implied vig on average due to correlated outcomes being priced at uncorrelated odds.

Sharp bettors prioritize low-vig markets and use line shopping across books to minimize the toll vig takes on their bankroll over time.

Why the No-Vig Price Is Your Baseline

If you believe a team has a 55% chance of winning and the no-vig price places them at 50%, you have found a positive expected value (+EV) bet. The edge is 5 percentage points. Without first computing the no-vig price, you cannot accurately measure your perceived edge — you would be measuring against a price that includes the book's margin, which overstates implied probability.

For a practical example: a -140 favorite on the moneyline. Raw implied probability is 140/240 = 58.33%. If the opponent is +120 (100/220 = 45.45%), the overround is 103.78% and the no-vig probabilities are 56.22% and 43.78% respectively. If you believe the favorite's true probability is 60%, you have approximately a 3.8% edge — a meaningful positive expectation.

Line Shopping and Vig Reduction Strategies

Reducing the vig you pay is one of the highest-leverage adjustments available to a recreational bettor. A bettor who always takes -110 and one who consistently finds -105 will see the second bettor's break-even win rate drop from 52.38% to 51.22% — a gap that compounds significantly over hundreds of bets.

Use multiple books: Having accounts at 4–6 sportsbooks allows you to shop for the best number on every bet.
Seek reduced-juice books: Some books specialize in lower-margin pricing, especially for spreads and totals.
Avoid same-game parlays and most futures: These carry the highest house edges of any bet type offered by a sportsbook.

Use this no-vig calculator alongside our sports calculators and the CPM calculator to make more data-driven decisions about your time and budget.

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Understanding American Odds vs. Implied Probability

American odds are the default format in US sportsbooks. They are expressed as either a negative number (how much you risk to win $100) or a positive number (how much you win for every $100 wagered). Converting between formats is essential for any bettor:

-110: Risk $110 to win $100 → implied probability 52.38%
+110: Risk $100 to win $110 → implied probability 47.62%
-200: Risk $200 to win $100 → implied probability 66.67%
+200: Risk $100 to win $200 → implied probability 33.33%
Even (+100 / -100): Risk $100 to win $100 → implied probability 50.00%

Our calculator accepts American odds directly and converts them to implied probability automatically, so you can focus on the analysis rather than the arithmetic.

Sources & References

American Gaming Association — Sports Betting Standards — American Gaming Association

No Vig Calculator

No-Vig Results