# Moneyline Odds Calculator

URL: https://speedycalculator.com/calculators/statistics/moneyline-odds/
Last updated: 2026-10-30

> The moneyline odds calculator converts American odds such as −150 or +250 into implied probability, decimal and fractional odds – or turns chances and probabilities into a moneyline – and shows the total return and profit on your stake and the chance of a streak.

## Inputs

- I know the odds as
- Chances for (winning outcomes)
- Chances against (losing outcomes)
- Probability of winning (%)
- Fractional odds – first number (profit)
- Fractional odds – second number (stake)
- Decimal odds
- Moneyline odds (minus for favourites) — Type −150 for a favourite or 250 for +250.
- Stake (any currency)
- Times in a row

## Results

- American moneyline odds
- Probability of winning (implied)
- Probability of losing
- Decimal odds
- Fractional odds (profit/stake)
- Odds in favour (win : lose)
- Odds against (lose : win)
- Favourite or underdog
- Total returned if it wins (stake + profit)
- Net profit if it wins
- Probability of winning that many times in a row
- Probability of losing that many times in a row
- Win/lose split

## Formula

```
Favourite (−X): probability = X ÷ (X + 100), profit = stake × 100 ÷ X
Underdog (+X): probability = 100 ÷ (X + 100), profit = stake × X ÷ 100
```

## Explanation

Moneyline (American) odds are centred on a 100 stake. A minus sign marks the favourite and tells you how much you must stake to win 100: at −150 you risk 150 to win 100. A plus sign marks the underdog and tells you how much a 100 stake wins: at +250 you win 250. A line of +100 is even money.

Implied probabilities follow directly. For −150 it is 150 ÷ (150 + 100) = 60%; for +250 it is 100 ÷ 350 = 28.57%. The calculator converts any moneyline into probability and into decimal and fractional odds, or works the other way from chances for and against, a probability or a fractional or decimal price. It also tells you whether the price makes the outcome a favourite or an underdog.

Enter a stake to see the total returned and the net profit if the bet wins, and a number of repetitions to see the probability of a winning or losing streak. In a two-way market the two implied probabilities add to more than 100% – the bookmaker’s vig – which the implied probability calculator can remove.

### How to use the Moneyline Odds Calculator

- **I know the odds as**
- **Chances for (winning outcomes)**
- **Chances against (losing outcomes)**
- **Probability of winning**
- **Fractional odds – first number (profit)**
- **Fractional odds – second number (stake)**
- **Decimal odds**
- **Moneyline odds (minus for favourites)** — Type −150 for a favourite or 250 for +250.
- **Stake (any currency)**
- **Times in a row**

Everything is calculated in your browser, so results appear instantly and nothing you type is sent to a server.

### How it works

Negative lines use |X|/(|X| + 100) and positive lines 100/(X + 100) for the implied probability. Decimal odds are its reciprocal; the moneyline is rebuilt from the decimal odds when another format is entered.

### Worked example

A team is priced at −150. Implied probability = 150 ÷ 250 = 60%, so the chance of losing is 40%. Decimal odds = 1 + 100/150 = 1.6667 and fractional odds 2/3. A 100 stake returns 166.67, a 66.67 profit. Winning two such bets in a row has probability 0.6² = 36%.

### Moneyline at a glance

MoneylineImplied probabilityProfit on 100−30075.00%33.33−20066.67%50.00−15060.00%66.67−11052.38%90.91+10050.00%100+15040.00%150+25028.57%250

## Worked example

Inputs — I know the odds as: American moneyline odds (e.g. −150 or +250); Moneyline odds (minus for favourites): -150; Stake (any currency): 100; Times in a row: 2.

Results — **American moneyline odds = −150**; Probability of winning (implied) = 60 %; Probability of losing = 40 %; Decimal odds = 1.6667; Fractional odds (profit/stake) = 2/3; Odds in favour (win : lose) = 3 : 2.

## Key terms

- **Decimal odds**: The total payout per 1 unit staked, stake included; 1 ÷ decimal odds is the implied probability.
- **Fractional odds**: Profit ÷ stake, written like 5/2 – a winning 2 pays 5 profit.
- **Moneyline odds**: American format: +250 is the profit on a 100 stake, −150 is the stake needed to win 100.
- **Implied probability**: The chance of winning that a price represents, before any bookmaker margin is removed.

## FAQ

**How do moneyline odds work?**
Negative numbers show the stake needed to win 100 (−150: stake 150 to win 100); positive numbers show the profit on a 100 stake (+250: win 250).

**How do I convert a moneyline to probability?**
Negative: |X| ÷ (|X| + 100), so −150 → 60%. Positive: 100 ÷ (X + 100), so +250 → 28.57%.

**What does +100 mean?**
Even money – stake 100 to win 100, a 50% implied chance, decimal 2.00.

**How do I convert a moneyline to decimal odds?**
Positive: 1 + X/100 (+250 → 3.50). Negative: 1 + 100/|X| (−150 → 1.667).

**How much do I win on a −110 bet?**
100/110 of the stake: a 110 stake wins 100 and returns 210.

**How are parlay payouts calculated?**
Convert each leg to decimal odds and multiply them, then multiply by the stake.


## Sources

- [OpenStax – Introductory Statistics 2e, Chapter 3: Probability topics](https://openstax.org/books/introductory-statistics-2e/pages/3-introduction)
- [Khan Academy – Statistics and probability](https://www.khanacademy.org/math/statistics-probability)