Free betting calculator
Odds Converter
Enter odds in any format to see the equivalent American, decimal and fractional prices instantly. Useful for comparing lines across books and regions.
American odds, e.g. +150 or -110
American(input)
+100
Decimal
2.000
Fractional
1/1
Implied probability 50.00%
How it works
All three formats describe the same price. Decimal odds are the total return per unit staked; fractional odds are the profit per unit; American odds show the profit on a $100 stake (positive) or the stake needed to win $100 (negative).
Fractional results are reduced from a denominator of 1,000, so some prices show as close approximations.
American +X → decimal = X / 100 + 1
American −X → decimal = 100 / X + 1
decimal ≥ 2 → American = +(decimal − 1) × 100
decimal < 2 → American = −100 / (decimal − 1)
fractional a/b → decimal = a / b + 1
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