1. What Are American Odds?

American odds (also called moneyline odds) are primarily used in the United States. Positive odds show how much profit you'd make on a $100 bet, while negative odds show how much you need to bet to win $100.

2. How Does the Calculator Work?

The calculator uses these formulas:

Example Calculations:

• +200 odds: 100/(200+100) = 33.33% probability
• -150 odds: 150/(150+100) = 60% probability

3. Importance of Probability Calculation

Details: Converting odds to implied probability helps bettors determine if a wager offers value by comparing to their own assessment of the true probability.

4. Using the Calculator

Tips: Enter the American odds (positive or negative whole number). The calculator will show the implied probability as a percentage.

5. Frequently Asked Questions (FAQ)

Q1: What do + and - mean in American odds?
A: + indicates the underdog (potential profit on $100 bet), - indicates the favorite (amount needed to bet to win $100).

Q2: How do I convert probability back to American odds?
A: For probability ≤50%: (100/probability - 100). For >50%: (-100)/(1/probability - 1).

Q3: Why is the implied probability important?
A: It shows the break-even point - you need to win more than this percentage to be profitable long-term.

Q4: What's the difference between American and decimal odds?
A: Decimal odds show total return per unit bet (including stake), while American shows profit relative to $100.

Q5: How do bookmakers build in their margin?
A: The sum of probabilities for all outcomes will exceed 100% - the difference is the bookmaker's overround.