Moneyline Odds Calculator

What Are Moneyline Odds?

Moneyline (American) odds express how much you risk or win relative to a $100 stake. Favorites show a minus sign (for example -250 means risk $250 to win $100). Underdogs show a plus sign (for example +150 means risk $100 to win $150). Related tools: Fractional Odds Calculator and Implied Probability Calculator.

How to Calculate Moneyline Odds

From chances for success ($F$) and chances against ($A$), the fractional odds are:

$$f = \frac{A}{F}$$

If $f > 1$ (underdog): moneyline $= f \times 100$
If $f < 1$ (favorite): moneyline $= -100 / f$
If $f = 1$ (even): moneyline $= +100$

Example

With 5 chances for and 2 against, $f = 2/5 = 0.4$. Because $f < 1$:

$$\text{moneyline} = \frac{-100}{0.4} = -250$$

Win probability is $5 / 7 \approx 71.43\%$. A $100 stake at -250 returns about $40 net profit if it wins ($140 total returned).

Payout From American Odds

Positive odds $+M$: net profit $= \text{stake} \times M / 100$
Negative odds $-M$: net profit $= \text{stake} \times 100 / M$

Frequently Asked Questions

What does -150 mean?

You must wager $150 to win $100 profit. The selection is a favorite relative to even money.

What does +150 mean?

A $100 stake wins $150 profit if the bet succeeds. The selection is an underdog.

How do I get probability from moneyline?

For negative odds $-M$, probability ≈ $M / (M + 100)$. For positive odds $+M$, probability ≈ $100 / (M + 100)$. This calculator builds odds from chances, so probability is $F / (F + A)$.

Is this financial advice?

No. The calculator is for educational conversion of chances into American odds and illustrative payout math only.

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