Enter the odds you want to convert into any of the 3 fields and hit the convert button.

Bet Amount
Probability %


Odds Converter Betting Tool

Convert any odds with our odds converter betting tool. Type in the odds you wish to convert into any of the 3 fields: fractional, decimal or moneyline, hit the convert button and our calculator will take care of the odds conversion for you. The tool allows you to convert any fractional (British), decimal (European / Australian) or moneyline (American) odds. You can also enter your proposed bet amount and the tool will calculate the profit and implied probability of the bet.

Oddsconverter.org is a not-for-profit website that strives to simplify the process of converting odds by providing a free odds converter tool for the benefit of everyone. Our site has been designed to make odds conversion informative, simple and accessible; it can be accessed via desktop, laptop, tablet or smartphone.

Different types of bookmaker odds

Odds are displayed differently in different countries and on various sports betting websites. For example, the United Kingdom has traditionally used fractional odds. However, close by in mainland Europe, decimal odds are the norm. To complicate matters further, moneyline odds are used in the United States. The reason they do this is primarily historical, odds have always been displayed this way and bookmakers and consumers have simply got use to it. Our odds conversion tool will display any odds that you want across all three different formats.

Fractional Odds

Fractional odds originated in the United Kingdom and are primarily used there today. Fractional odds are sometimes known as ‘Traditional’ or ‘British’ odds. The price quoted by the bookmaker or sportsbook about an outcome is quoted as a fraction, hence the name fractional.

For example:
For an outcome that a sportsbook quotes at moneyline odds of +150, or $2.50, the odds will be displayed as 3/2. This means that for every $2 staked on the event, $3 will be returned in winnings.

For a list of popular UK bookmakers, see here

*One difference between decimal and fractional odds is that the stake is not calculated into the quote price for fractional odds.

Decimal Odds

Decimal odds are used mostly in mainland Europe, Australia, New Zealand and Canada. Odds are displayed in decimal format. The total return (stake + winnings is included in the quote).

Let’s look at the odds of a football match. If the odds of Arsenal winning a football match are 5/2 or +250 to win the match, then the decimal odds will be displayed as $3.50. A $1 bet stake will return $3.50, which includes the profit plus the original bet stake. Use our odds converter to convert any decimal odds.

Moneyline (American) Odds

The Moneyline system, sometimes referred to as ‘American Odds’, is used throughout the United States of America. Reading the odds varies depending on whether there is a minus (-) sign or a positive (+) sign displayed before the quote price. If a minus (-) is displayed, this number represents the total amount that is needed to be staked / risked in order to win $100.

If the Los Angeles Lakes are quoted at -250 to win a basketball match, this means that $250 dollars will need to be risked in order to win $100.

These odds equate to 2/5 in fractional and $1.40 in decimal formats.

A positive or plus (+) sign in front of the odds quote means that the odds displayed indicate the winnings that will be returned from a $100 bet.

For example: if the odds of a Denver Broncos win are +150, this means that a $100 bet will return a profit of $150, the stake of $100 will also be returned.

Odds of +150 equate to 3/2 or $2.50 in fractional and decimal formats.

Implied probability

Implied probability is the likelihood that the outcome might eventuate given the odds that are being offered. It does not reflect the actual probability. We have included it in our odds converter tool because it assists by creating a reference point between the various odds.