Math & Business Productivity

No-Vig Calculator

Calculate no-vig fair odds, true implied probability, and sportsbook vig/overround for sports betting. Devig 2-way American odds instantly.

Interactive Calculator

1. Provide Details

American Odds (Outcome A)

American Odds (Outcome B)

2. Output Results

Sportsbook Vig / Juice4.76 %

Outcome A Fair Odds+100

Outcome B Fair Odds+100

Outcome A Fair Implied Probability50.0 %

How to Calculate: Formula & Steps

Converts American odds to decimal rates, calculates the combined overround (vig), and normalizes individual probabilities to find the 'fair' odds.

Formula Used:Fair Probability = Implied Probability ÷ Total Implied Probabilities

Step-by-Step Calculation Example

Odds of -110 (52.38% probability) and +110 (47.62% probability) sum to 100%. If both are -110 (52.38% each), the sum is 104.76%. Removing the 4.76% vig gives a fair probability of 50.00% and fair odds of +100.

Inputs and Assumptions

Enter values that match your project or situation. The calculator uses the following fields and defaults; update them before relying on the estimate.

American Odds (Outcome A): Default: -110
American Odds (Outcome B): Default: -110

Common Mistakes to Avoid

Entering fractional or decimal odds. This calculator is designed specifically for American odds format (e.g. -110, +150).

Practical Use Cases

Hedging and arbitrage calculation
Expected value (+EV) betting audits
Removing sportsbook overround

Expert Tips

A lower vig percentage indicates a more competitive market with better pricing for bettors.

No-Vig Sports Betting Math: Removing Juice & Finding True Fair Odds

Sportsbooks build a mathematical profit margin—known as the vig (vigorish) or juice—into their betting lines. Calculating no-vig fair odds removes this bookmaker markup to reveal the market’s true implied win probabilities for Expected Value (+EV) auditing.

The Implied Probability & Vig Formulas

Negative American Odds (-X): Implied Win % = |X| ÷ (|X| + 100)

Positive American Odds (+Y): Implied Win % = 100 ÷ (Y + 100)

Sportsbook Vig (%) = (Implied Prob A + Implied Prob B - 1) × 100

The Power Method for Fair Probability

Fair Probability (Outcome A) = Implied Prob A ÷ (Implied Prob A + Implied Prob B)

For standard -110 / -110 lines (52.38% each = 104.76% sum), removing the 4.76% juice gives a true 50.00% fair probability and +100 even money fair odds.

Disclaimer

This calculation tool is provided for educational and informational estimation purposes only. Results are based on mathematical formulas and user-supplied parameters. They do not constitute formal underwriting, financial, tax, engineering, or legal determinations.

Frequently Asked Questions About No-Vig Calculator

What is no-vig (devigged) betting?

No-vig, or "devigged," odds remove the sportsbook's built-in profit margin (the vig, or overround) from a betting line to reveal the true, fair implied probability of each outcome. Calculate fair odds instantly with our free No-Vig Calculator.

How do you remove the vig from American odds?

Convert each side's American odds to implied probability, sum both probabilities (the total will exceed 100% due to the vig), then divide each individual probability by that total to normalize them back to a true 100% — this gives you the fair, no-vig probability and fair odds for each side.

What is a typical vig (overround) percentage at sportsbooks?

Standard -110/-110 two-way lines carry roughly a 4.5% to 4.8% vig. More competitive or high-volume markets can have vig as low as 2%, while less liquid markets (props, futures) often carry 8% or more.

Why do bettors calculate no-vig odds?

Removing the vig lets bettors compare a sportsbook's line to the "true" market probability, which is useful for identifying positive expected value (+EV) bets, comparing odds across multiple books, and building more accurate parlay or hedge calculations.

Editorial contact: Rowan Vance

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