NEW✦ TheRundown is now available as an MCP server — connect your AI agent to real-time sports data →

No-Vig Calculator

Remove the bookmaker margin (vig) to find fair odds and true probabilities. Compare markets and identify value betting opportunities across different sportsbooks.

Results

Enter values to see results
--

What is it?

A No-Vig Calculator removes the bookmaker's profit margin (vigorish) from betting odds to reveal the true market probabilities. Bookmakers add vig to ensure profit regardless of the outcome, but this makes it difficult to compare odds across different sportsbooks. By removing the vig, you can see fair odds that represent the genuine market assessment and identify which sportsbooks offer the best value.

Why use it?

  • Find true market probabilities without bookmaker bias
  • Compare odds across different sportsbooks fairly
  • Identify the best value betting opportunities
  • Calculate accurate expected value for bets
  • Use fair odds for Kelly Criterion calculations
  • Understand the true cost of betting odds

How to use it

  1. 1Enter odds for both sides of a betting market
  2. 2View the calculated fair odds and probabilities
  3. 3Compare fair odds across different sportsbooks
  4. 4Identify which book offers the best value
  5. 5Use fair probabilities for EV and Kelly calculations
  6. 6Make informed decisions based on true market odds

Example

Example: -110/-110 market has 52.4% + 52.4% = 104.8% total probability. Fair odds = 52.4% ÷ 104.8% = 50% each = +100/+100. This shows the true market assessment without the 4.8% bookmaker margin.

No-Vig Calculator FAQ

Understanding Vig

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.