No-Vig Calculator

Understanding Vig

1

What is vig and why should I remove it?

Vig (vigorish) is the bookmaker's profit margin built into odds. For example, -110 odds on both sides create 104.8% total probability (52.4% + 52.4%), with 4.8% being the vig. Removing vig gives you fair odds that represent true market probabilities, making it easier to compare different sportsbooks and identify value bets.

2

How do I calculate fair odds without vig?

Convert odds to implied probabilities, then normalize them to total 100%. Formula: Fair Probability = Implied Probability ÷ Total Market Probability. Example: -110/-110 market = 52.4%/52.4% = 104.8% total. Fair odds = 52.4% ÷ 104.8% = 50% each = +100/+100 fair odds.

3

What is the difference between fair odds and offered odds?

Offered odds include the bookmaker's margin (vig), while fair odds represent the true market assessment without profit margin. Fair odds are always better than offered odds. For example, -110 offered odds become +100 fair odds. Fair odds help you identify when a bookmaker is offering better or worse prices than the market consensus.

4

How do I use fair odds for value betting?

Compare fair odds across different sportsbooks to find the best prices. If Book A has -110/-110 (fair +100/+100) and Book B has -105/-115 (fair +102.5/+97.5), Book A offers better value on the favorite. Fair odds also help you determine true win probabilities for expected value calculations and Kelly Criterion betting.

5

Why do fair probabilities always add up to 100%?

Fair probabilities represent the true market assessment without bookmaker bias. In a two-way market, one outcome must occur, so probabilities must total 100%. The vig artificially inflates the total probability above 100% to create the bookmaker's profit margin. Removing vig normalizes the probabilities to reflect reality.

6

How do I find the sharpest sportsbook odds?

Sharp sportsbooks (like Pinnacle, Circa) typically have the lowest vig and most accurate odds. Use our No-Vig Calculator to compare fair odds across different books. Books with lower vig (closer to 100% total probability) generally offer better value. Professional bettors often use sharp books as their "fair odds" reference point.