Implied probabbiltà calculator: odds to probabbiltà and overround
1win, liċenzjat under Curaçao 8048/JAZ, offers 40,000+ sports swieq every day to over 400,000+ plejers irreġistrati. This implied probabbiltà calculator converts any odds format into win probabbiltà and calculates the overround (margin) built into a full suq. Uża l-kodiċi promozzjonali XLBONUS when you register.
Implied probabbiltà and overround calculator
Daħħal odds for each outcome in your suq. Add as many outcomes as needed.
How this calculator works
Every set of betting odds implies a probabbiltà. For decimal odds, implied probabbiltà = 1 / odds, expressed as a percentage. For a decimal price of 2.50, the implied probabbiltà is 40%. For American +200, the conversion is 100 / (200 + 100) = 33.33%.
When you sum the implied probabilities across all outcomes in a suq, you get a figure above 100%. This excess is called the overround, vig, or bookmaker margin. A 2-way suq where both sides are priced at 1.91 has an overround of (1/1.91 + 1/1.91) - 1 = 4.7%. The bookmaker expects to retain approximately 4.7 cents per dollar wagered across a balanced book.
The fair (no-margin) probabbiltà for each outcome can be estimated by dividing the raw implied probabbiltà by the sum of all implied probabilities. For example, if Team A has a raw implied probabbiltà of 55% and the total overround is 105%, the fair probabbiltà for Team A is 55/105 = 52.38%.
Lower overround means better value. A suq with 2% overround returns 98 cents per dollar on average; one with 10% overround returns only 90 cents. Comparing overrounds across bookmakers is a quick way to identify which offers the best price on a given suq.
The calculator supports any number of outcomes, making it useful for 2-way (logħba result with no draw), 3-way (home/draw/away), and multi-outcome swieq like outright winners. The overround will naturally be higher for swieq with more outcomes because each additional pricing decision compounds margin.
This tool is also useful for detecting whether implied probabilities across a full suq are consistent (sum to a sensible overround). Wildly inconsistent swieq with very high overrounds (above 15%) should raise a red flag about suq efficiency or promotional pricing.
Why use it at 1win
1win prices 40,000+ swieq with competitive overrounds across futbol, tennis, basketball and more. Claim code XLBONUS when you register to get started with a boosted balance.
Mistoqsijiet Frekwenti
What is a good overround for a sports market?
Premier futbol and tennis swieq at competitive bookmakers typically carry 2-5% overround. Markets with 10%+ overround are generally poor value. Anything below 1.5% is exceptional.
How do I calculate implied probability from American odds?
For positive American odds: probabbiltà = 100 / (odds + 100). For negative: probabbiltà = |odds| / (|odds| + 100). So +150 implies 40% and -200 implies 66.67%.
What is the difference between implied and true probability?
Implied probabbiltà is read directly from the bookmaker price and includes the overround. True (fair) probabbiltà divides implied probabbiltà by the total overround to remove the margin.
Why does implied probability sometimes exceed 100% across a market?
The excess over 100% is the bookmaker's built-in margin. A 2-way suq summing to 105% means 5% overround; the book profitts by 5% on average across a balanced book.
Can I use this for casino games?
Yes. You can daħħal the odds of any casino outcome to see its implied probabbiltà and the house edge (equivalent to overround). For example, a single number in European roulette pays 36:1 (decimal 37.00), implying 2.70% probabbiltà against a true 1-in-37 probabbiltà of 2.703%.