American Odds Converter
Convert American odds into decimal, fractional and implied probability.
About American Odds Converter
American odds switch definition at the even-money point, which is why they change sign. Minus 150 means staking 150 to win 100, while plus 150 means staking 100 to win 150. The sign change is why American odds cannot be compared arithmetically across favourites and underdogs without converting first.
Formula
American Odds
Positive odds give profit on a 100 stake; negative odds give the stake needed to win 100
- positive odds
- Profit from a 100 stake
- negative odds
- Stake required to win 100
Worked example
With the default values below, American Odds Converter returns Decimal Odds of 1.6667. Change any input above and every figure here is recalculated in your browser.
Inputs used
- American oddsaccepts -10,000–10,000
- -150
Results
- Decimal Odds
- 1.6667
- Implied Probability
- 60.0000%
- Fractional Odds
- 67/100
- Profit on a 100 Stake
- 66.67
- Favourite or Underdog
- Favourite — negative odds show the stake needed to win 100
Step by step
- 1Values used
- 2American Odds
- 3Decimal Odds= 1.6667
- 4Implied Probability= 60.0000
- 5Fractional Odds= 67/100
- 6Profit on a 100 Stake= 66.67
- 7Favourite or Underdog= Favourite — negative odds show the stake needed to win 100
Assumptions and limits
- The result is derived only from the single input listed above. Anything not among them is not part of the calculation.
- In particular, this calculator does not take inflation, tax, fees or charges or compounding frequency into account.
- Figures are rounded for display to 4 decimal places, so totals built from several rounded parts can differ slightly from the unrounded arithmetic.
- These figures are estimates based on population-average formulas and are intended for training and recreational planning only. They are not medical advice. Consult a qualified health professional before starting or changing an exercise programme, particularly if you have an existing medical condition.
- This is an estimate for general information and not professional medical advice. See the full disclaimer for the limits that apply to this kind of calculator.
How these calculators are built and tested is described on the Methodology page. If a figure looks wrong, please report it.
These figures are estimates based on population-average formulas and are intended for training and recreational planning only. They are not medical advice. Consult a qualified health professional before starting or changing an exercise programme, particularly if you have an existing medical condition.
Frequently Asked Questions
How is American Odds calculated?
Positive odds give profit on a 100 stake; negative odds give the stake needed to win 100 American odds switch definition at the even-money point, which is why they change sign. Minus 150 means staking 150 to win 100, while plus 150 means staking 100 to win 150.
Why does American Odds matter?
The sign change is why American odds cannot be compared arithmetically across favourites and underdogs without converting first.
What values do I need to enter?
This calculator takes 1 input: American odds. The pre-filled defaults are a realistic starting point — replace them with figures from your own environment for a result you can act on.