What is the Moneyline Odds Calculator?
American "moneyline" odds are written as a positive or negative number, such as +150 or -200. This calculator converts those odds plus your stake into the figures that actually matter: your net profit, your total payout, the equivalent decimal odds, and the implied probability the bookmaker is assigning to that outcome.
How to use it
Enter the moneyline odds exactly as shown by the sportsbook — type a positive number for an underdog (e.g. 150) or a negative number for a favorite (e.g. -200). Then enter the amount you plan to wager. The calculator instantly returns your profit if the bet wins, the total amount returned (stake plus profit), the decimal-odds equivalent, and the implied probability of the outcome.
The formula explained
When odds are positive, they tell you how much profit a $100 stake would earn: $$\text{profit} = \text{stake} \times \frac{\text{odds}}{100}$$. When odds are negative, they tell you how much you must stake to win $100: $$\text{profit} = \text{stake} \times \frac{100}{\left|\text{odds}\right|}$$. Total payout is always your stake plus that profit. Implied probability is $$\frac{100}{\text{odds} + 100}$$ for positive odds and $$\frac{\left|\text{odds}\right|}{\left|\text{odds}\right| + 100}$$ for negative odds, expressed as a percentage.
Worked example
Suppose you bet $100 at +150. \(\text{Profit} = 100 \times (150 \div 100) = \$150\), so the total payout is $250. The decimal-odds equivalent is \(250 \div 100 = 2.5\), and the implied probability is \(100 \div (150 + 100) = 40\%\). If instead the odds were -200 on a $100 stake, \(\text{profit} = 100 \times (100 \div 200) = \$50\), \(\text{payout} = \$150\), and the implied probability is \(200 \div 300 = 66.67\%\).
FAQ
What does a positive number mean? Positive (e.g. +150) marks the underdog and shows the profit on a $100 stake. What does a negative number mean? Negative (e.g. -200) marks the favorite and shows how much you must stake to win $100.
Is implied probability the true chance of winning? No — it includes the bookmaker's margin ("vig"), so combined probabilities across all outcomes usually exceed 100%.
For entertainment only. This tool helps you understand odds; it is not betting advice.
