Implied πιθανότητα calculator: αποδόσεις to πιθανότητα and overround
1win, αδειοδοτημένο under Curaçao 8048/JAZ, offers 40,000+ αθλήματα αγορές every day to over 400,000+ εγγεγραμμένοι παίκτες. This implied πιθανότητα calculator converts any αποδόσεις format into win πιθανότητα and calculates the overround (margin) built into a full αγορά. Χρησιμοποίησε τον κωδικό προσφοράς XLBONUS when you register.
Implied πιθανότητα and overround calculator
Βάλε αποδόσεις for each outcome in your αγορά. Add as many outcomes as needed.
How this calculator works
Every set of betting αποδόσεις implies a πιθανότητα. For decimal αποδόσεις, implied πιθανότητα = 1 / αποδόσεις, expressed as a percentage. For a decimal price of 2.50, the implied πιθανότητα is 40%. For American +200, the conversion is 100 / (200 + 100) = 33.33%.
When you sum the implied probabilities across all outcomes in a αγορά, you get a figure above 100%. This excess is called the overround, vig, or bookmaker margin. A 2-way αγορά 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) πιθανότητα for each outcome can be estimated by dividing the raw implied πιθανότητα by the sum of all implied probabilities. For example, if Team A has a raw implied πιθανότητα of 55% and the total overround is 105%, the fair πιθανότητα for Team A is 55/105 = 52.38%.
Lower overround means better value. A αγορά 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 αγορά.
The calculator supports any number of outcomes, making it useful for 2-way (αγώνας result with no draw), 3-way (home/draw/away), and multi-outcome αγορές like outright winners. The overround will naturally be higher for αγορές with more outcomes because each additional pricing decision compounds margin.
This tool is also useful for detecting whether implied probabilities across a full αγορά are consistent (sum to a sensible overround). Wildly inconsistent αγορές with very high overrounds (above 15%) should raise a red flag about αγορά efficiency or promotional pricing.
Why use it at 1win
1win prices 40,000+ αγορές with competitive overrounds across ποδόσφαιρο, τένις, μπάσκετ and more. Claim code XLBONUS when you register to get started with a boosted balance.
Συχνές Ερωτήσεις
What is a good overround for a sports market?
Premier ποδόσφαιρο and τένις αγορές 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 αποδόσεις: πιθανότητα = 100 / (αποδόσεις + 100). For negative: πιθανότητα = |αποδόσεις| / (|αποδόσεις| + 100). So +150 implies 40% and -200 implies 66.67%.
What is the difference between implied and true probability?
Implied πιθανότητα is read directly from the bookmaker price and includes the overround. True (fair) πιθανότητα divides implied πιθανότητα 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 αγορά summing to 105% means 5% overround; the book κέρδοςs by 5% on average across a balanced book.
Can I use this for casino games?
Yes. You can βάλε the αποδόσεις of any casino outcome to see its implied πιθανότητα and the house edge (equivalent to overround). For example, a single number in European roulette pays 36:1 (decimal 37.00), implying 2.70% πιθανότητα against a true 1-in-37 πιθανότητα of 2.703%.