Formula / logic
Decimal odds are the common bridge. For positive American odds: decimal = 1 + American/100. For negative American odds: decimal = 1 + 100/|American|. Fractional a/b converts to decimal 1 + a/b. Implied probability is 1/decimal.
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Odds Converter
Convert decimal, American and fractional odds into equivalent formats and see the associated implied probability.
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Result
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Example
Decimal 2.50 converts to American +150 and fractional 3/2. Its implied probability is 40.00%.