Understanding American to Decimal Conversion
For positive American odds (+), divide by 100 and add 1. For negative American odds (-), divide 100 by the absolute value and add 1.
Practical Example:
-110 American odds convert to approximately 1.91 in decimal format.
Positive vs. Negative American Odds
American odds use a baseline of $100 to express value, but they flip the logic depending on whether the number is positive or negative.
Positive Odds (+): Underdog / High Return
A number like +200 means if you bet $100, you win $200.
*Conversion:* (+200 / 100) + 1 = 3.00
Negative Odds (-): Favorite / Lower Return
A number like -150 means you must bet $150 to win $100.
*Conversion:* (100 / 150) + 1 = 1.67
Decimal odds unify this into a single consistent number, which is why they are preferred for math and modeling.
Frequently Asked Questions
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