Odds Converter
Convert betting odds between American (+150 / -200), decimal (2.50), fractional (3/2), and implied probability in one place. Type any format and see the rest update instantly.
Enter your numbers above to see the result.
Worked example
A +150 underdog is the same as 2.50 decimal, 3/2 fractional, and a 40% implied probability of winning. A -200 favorite equals 1.50 decimal, 1/2 fractional, and 66.7% implied.
FAQ
What is implied probability?
Implied probability is the win rate the odds bake in. At -110 the book is implying you need to win about 52.4% of the time just to break even — the extra is the vig.
How do I convert American odds to decimal?
For positive odds: (odds / 100) + 1. For negative: (100 / |odds|) + 1. So +150 is 2.50 and -200 is 1.50.
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