Decimal odds to American odds
Decimal odds of 2 or more give positive American odds; below 2 they give negative odds. The tool picks the right form for you.
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How to use it
- Enter decimal odds.
- The result appears straight away and updates as you edit.
- Copy the result, or copy a link that keeps the same values to share it.
How it is calculated
If D ≥ 2: American = +(D − 1) × 100. If D < 2: American = −100 ÷ (D − 1). Implied probability = 1 ÷ D.
Example
Inputs: Decimal odds = 1.91. Result: American odds: -109.89; Implied probability: 52.356%.
Limits and caveats
- American odds are rounded to 2 decimal places, so 1.91 gives −109.89.
- Implied probability includes the margin of whoever set the price.
Questions about this tool
What is 1.50 in American odds?
It is −200, because 100 ÷ 0.5 = 200.
What is 3.00 in American odds?
It is +200, because (3 − 1) × 100 = 200.
Why does 1.91 not give exactly −110?
Because −110 is 1.9091 in decimal; 1.91 is a rounded figure, so it gives −109.89.