# American odds

**American odds, **also refered to as moneyline odds, are the odds favoured by American bookmakers. The odds are quoted as either positive or negative and are accompanied with a plus or minus symbol to show the favourite and the underdog.

## How to read American odds

Positive odds represent the underdog in a bet, meaning this outcome is considered less likely to happen than not. The positive odds indicate how much money would be won from a $100 bet.

For example, if odds of +300 were quoted, then a $100 bet would see returns of $300 and a total payout of $400.

Negative odds represent the favourite in a bet, meaning this outcome is considered more likely to happen than not. The negative odds represent how much money must be bet to see returns of $100.

For example, if odds of -300 were quoted, then a $300 bet would see returns of $100 and a total payout of $400.

Odds of +100 are also referred to as evens, meaning the bookmaker is suggesting that the chance of the outcome occurring is 50/50.

## Calculating returns using American odds

It is relatively straight forward to calculate returns using American odds if you are placing a $100 bet - but often this is not the exact figure of our stake.

### Calculating returns with positive odds

To calculate returns on a positive odds bet, the following formula is used:

Stake * (odds / 100)

For example

Arsenal vs Chelsea - Arsenal to win odds of +250 with a $10 bet stake

10 * (250 / 100) = 25

Therefore returns would be $25.

### Calculating returns with negative odds

To calculate returns on a negative odds bet, the following formula is used:

Stake * ((100 / (odds * - 1))

For example

Liverpool vs Everton - Liverpool to win at odds of -400 with a $10 stake

10* ((100 / (-400 * -1)) = 2.5

Therefore returns would be $2.50.

## Converting American odds into decimal odds

In order to convert American odds into decimal odds, the following formulas are used.

For **positive odds**, the formula for converting American odds into decimal odds is as follows:

Odds / 100 + 1

For example

Atalanta vs Roma - over 2.5 goals at odds of +150

150 / 100 + 1 = 2.50

For **negative odds**, the formula for converting American odds into decimal odds is as follows:

100 / Odds + 1

For example

Inter Milan vs AC Milan - Inter to win at odds of -250

100 / 250 + 1 = 1.40

## Converting decimal odds into American odds

To convert decimal odds of **over 2.00** into American odds, the following formula is used:

(Decimal - 1) * 100

For example

Juventus vs Turin - both teams to score at odds of 3.35

(3.35 - 1) * 100 = +235

To convert decimal odds of **under 2.00 **into American odds, the following formula is used:

-100 / (decimal - 1)

For example

Roma vs Atalanta - Roma to win at odds of 1.65

-100 / (1.65 - 1) = -154

## Converting American odds into fractional odds

In order to convert American odds into fractional odds, the odds are arranged in a certain way and then reduced to their simplest form.

For **positive odds**, to convert American odds into fractional odds, the odds are arranged as follows:

Odds/100

And then reduced into simplest form.

For example

Barcelona vs Real Madrid - Real Madrid to win at odds of +300

300/100 reduces down into 3/1

For **negative odds**, to convert American odds into fractional odds, the odds are arranged as follows:

100/odds

And then reduced into simplest form.

For example

Atletico Madrid vs Valencia - Atletico Madrid to win at odds of -250

100/250 reduces down to 2/5

## Converting fractional odds into American odds

Fractional odds **above 1/1** will provide positive American odds. To convert fractional odds of above 1/1 into American odds, the following formula is used:

(numerator / denominator) *100

For example

Barcelona vs Valencia - over 2.5 goals at odds of 7/4

(7 / 4) * 100 = +175

Fractional odds of **under 1/1** will provide negative American odds. To convert fractional odds under 1/1 into American odds, the following formula is used:

-100 / (numerator / denominator)

For example

Juventus vs Roma - Juventus to win at odds of 1/4

-100 / (1 / 4) = -400

### Converting American odds into implied probability

Implied probability is the conversion of odds into a percentage to show the expected probability of an outcome.

The formula for converting **positive American odds** into implied probability is as follows:

100 / (odds + 100) * 100 = implied probability

For example

Chelsea to beat Manchester United at odds of +200

100 / (200 + 100) * 100 = 33.3%

The formula for converting **negative American odds** into implied probability is as follows:

Negative American odds / (odds + 100) * 100 = implied probability

For example

Manchester United vs Chelsea - Manchester United to win at odds of -200

200 / (200 + 100) * 100 = 66.7%