How to use this betting tool
- Enter the requested values using the units shown.
- Choose any settlement option that matches your market.
- Select Calculate and review the formula, assumptions, and supporting figures.
#090 · Odds Formats and Market Comparison Tool
American to Decimal Odds Converter
Convert positive or negative American moneyline odds to decimal odds, implied probability, and a sample return.
Calculator
Enter market valuesUSD
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What this tool calculates
Convert positive or negative American moneyline odds to decimal odds, implied probability, and a sample return.
For positive A: decimal = 1 + A/100. For negative A: decimal = 1 + 100/|A|. Implied probability = 1/decimal.
Results are informational estimates. Confirm final grading, limits, and promotional terms with the operator.
Worked example
American +150 converts to decimal 2.50 and 40% implied probability. American −200 converts to decimal 1.50 and 66.67%.
| Check | Meaning |
|---|---|
| Inputs | Use values from one consistent market or settled event. |
| Output | The result follows the formula and assumptions stated on this page. |
Tips and limitations
American odds of zero or values between −100 and +100 are not valid standard moneylines. Conversion does not remove the bookmaker margin.
Keep stakes proportionate to what you can afford to lose. No calculator removes betting risk.
FAQ
What inputs does the American to Decimal Odds Converter require?
The calculator uses only the values displayed in its input card. Each value is validated before a result is shown.
When are the results rounded?
The calculation keeps JavaScript numeric precision internally and rounds only the displayed figures to practical decimal places.
Does this result include bookmaker-specific settlement rules?
No. The stated assumptions are applied, while voids, promotions, deductions, taxes, and operator-specific rules must be checked separately.
Can this calculation predict whether a bet will win?
No. It evaluates the entered numbers or settled score; it does not predict an event or provide a betting signal.
Why might my bookmaker show a different figure?
Differences can come from odds changes, currency rounding, push or void treatment, commission, bonus terms, or a different calculation convention.
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Calculation reference
| Item | Definition |
|---|---|
| Primary output | Decimal odds |
| Method | For positive A: decimal = 1 + A/100. For negative A: decimal = 1 + 100/|A|. Implied probability = 1/decimal. |
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