Convert bookmaker odds into probabilities, remove overround, and inspect percentages for single or multi markets. Use cleaner numbers to compare selections with more confidence.
| Outcome | Decimal Odds | Raw Implied % | Fair Implied % |
|---|---|---|---|
| Home Win | 2.20 | 45.4545% | 42.9066% |
| Draw | 3.30 | 30.3030% | 28.6044% |
| Away Win | 3.00 | 33.3333% | 31.4890% |
Decimal odds: Implied Probability = 1 / Decimal Odds
Fractional odds: Implied Probability = Denominator / (Numerator + Denominator)
American positive odds: Implied Probability = 100 / (Odds + 100)
American negative odds: Implied Probability = |Odds| / (|Odds| + 100)
Book percentage: Sum all raw implied probabilities
Overround: (Book Percentage - 1) × 100
Fair probability: Raw Probability / Total Raw Probability
Fair decimal odds: 1 / Fair Probability
Implied probability turns betting odds into percentage chances. This makes comparisons easier. A probability view is more intuitive than raw odds. It also helps you check whether a market looks overpriced or underpriced.
Bookmakers publish decimal, fractional, and American odds. Each format expresses the same idea in a different way. This calculator accepts all three formats. That saves time when you compare odds across exchanges, sportsbooks, or historical reports.
In a multi outcome market, total implied percentages often exceed 100%. That extra amount is the overround. It reflects bookmaker margin. When you remove that margin, you get fair percentages that better represent the market’s internal probability split.
This page supports two workflows. First, you can convert one odds figure into its implied percentage. Second, you can paste several outcomes together and estimate overround, fair percentages, and fair decimal odds for each entry.
Fair percentages help you compare your own model with the market. If your estimated chance is higher than the fair market chance, the selection may offer value. If it is lower, the price may be too short.
CSV export helps with spreadsheets, audits, and deeper analysis. PDF export helps when you need a clean report. Both are useful for research, trading notes, and quick record keeping.
Implied probability is a useful tool, not a guarantee. Odds can move quickly. Margin can differ by bookmaker and market type. Always combine price analysis with sound data, discipline, and risk control before making any decision.
Implied probability is the percentage chance suggested by betting odds. It translates price into probability, so you can compare outcomes more clearly and judge market expectations faster.
That happens because of bookmaker margin. In multi outcome markets, the combined raw probabilities usually include overround. This creates a total above 100% before fair adjustment.
Fair probability is the adjusted percentage after removing market margin. It redistributes each raw implied probability proportionally, so the final total equals exactly 100%.
Yes. The calculator supports all three common formats. You can analyze one odds value or a full market using the same selected format.
Use one line per outcome. Write the outcome name first, then a comma, then the odds value. Example: Team A, 2.40
Overround is the amount above 100% in a market’s total raw implied probability. It represents bookmaker margin and affects the fairness of listed prices.
CSV is useful for spreadsheet work, sorting, and record keeping. PDF is useful for printing, sharing, and saving a simple snapshot of the current calculation.
No. It is a strong pricing tool, but it should be combined with your own research, model assumptions, bankroll rules, and market context.
Important Note: All the Calculators listed in this site are for educational purpose only and we do not guarentee the accuracy of results. Please do consult with other sources as well.