Implied Probability Calculator

How to Use This Calculator

1. Select your odds format (American, Decimal, or Fractional).
2. Enter the odds value.
3. See implied probability and break-even win rate instantly.
4. Use the No-Vig Fair Odds tab to compare both sides of a market and remove the juice.
5. Use Professional for three-way markets (soccer 1X2) and arbitrage detection.

Formula

Example

Frequently Asked Questions

• What is implied probability? ▼
  Implied probability is the win percentage embedded in betting odds. American −110 → 1/1.909 = 52.4%. This means the bookmaker implies a 52.4% chance for each side of an even game, which adds up to 104.8% (the 4.8% is the vig).
• How do I convert American odds to probability? ▼
  For negative odds (−110): probability = |odds| / (|odds| + 100) = 110/210 = 52.4%. For positive odds (+150): probability = 100 / (odds + 100) = 100/250 = 40%.
• What is the vig or juice? ▼
  The vig (vigorish) is the sportsbook's commission. Standard −110/−110 lines have ~4.76% vig: implied probs sum to 104.76%, meaning the book keeps 4.76 cents of every dollar wagered long-term.
• What are no-vig fair odds? ▼
  No-vig odds remove the bookmaker's markup to show the true market probability. Divide each side's implied probability by the total overround: Fair P1 = Raw P1 / (P1 + P2).
• What is arbitrage betting? ▼
  Arbitrage (arb) exists when the sum of fair probabilities across all outcomes is less than 100%. You can bet all sides proportionally for a guaranteed profit regardless of outcome.

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