Calculator for Sports Odds

Easily convert between American (moneyline), Decimal and fractional odds utilizing our odds calculator. You can calculate payouts for placing sports bets and setting the amount wagered (our system utilizes $100.00 by default). Additionally, you can see the various odds set by the book maker and corresponding implied probability of winning (expected win %).

How to Use the Odds Calculator

Use desired ratios while inserting odds in the box and in turn notice how such ratios are instantly converted into various other formats. The only adjustment you may wish to make to the bet is its amount which is in dollars and which determines your payout on the basis of the odds offered. Pushing the reset button helps you to go back to the beginning.

The odds to bet on a sport are typically presented in one of three styles: American, Decimal or Fractional.

American Odds

These are considered the most popular ways of expressing betting in the United states and can be either plus or minus. If the odds are positive (+200), it shows net winnings that will be earned by a player from putting in a $100 bet. Conversely, if the odds are negative (-200), it denotes how much money needs to be put in a wager to win $100.

Decimal Odds

This format is widely adopted in the European, Canadian, and Australian regions. The odds represent the winning share from a one dollar stake. An example would be, for every one dollar placed, if the odds were at 1.5 then you would get back a dollar fifty cent including your original bet. Such a number always has to be more than one.

Fractional Odds

Widespread within the UK and Ireland, they are mathematically represented as fractions. Let’s take the case of 5/1 odds. You can also say it like “five to one”. It indicates that for every $1 bet you win $5.

Implied Probability

Odds are set by the bookmakers regarding an outcome, and this outcome is seen as a probability, and numerical odds further explicate probabilities which are always closely between 0% – 100%. Quite the opposite, it shows how many times you wouldn’t expect to win out of the number shown in the odds that they have displayed.

It is also important to note here that this does not mean every sports betting site will use the same format, therefore this can be a useful tool to help you change the odds to a format you want. You can also check the future outcome predicted by the odds-makers by placing the line at odds, which you think makes it fair. If it makes sense, this will be helpful in affording you a better notion of what you are betting on.

It is for single bet (or wagers) profits only, so if you are interested in parlay or multiple bets, please go here.

How to Convert Odds into a Percent and Vice Versa

This odds converter tool is the best way to go between the different formats but if someone really wants to know the math behind how it works, I guess it is fine too.

Odds Conversion Guide from Odds to Probability Percentage

Decimal

Converting from decimal to implied probability percentage is very simple. You simply take the decimal odds and take a reciprocal and then multiply it by a hundred.

As in this case where the odds are at 2: (1/2)* 100 = 50%

American

Now to convert american odds into percentage, if the number is positive, you have to use one formula but if it is negative, there is another formula to use. The positive one smart takes american odds and adds it to 100 in order to divide it by 100 and then multiply the result by 100.

For example, betting +150, you would plug in 150, the equation becomes (100/(150+100)) * 100 which results in a total of 40%

Now for negative odds, it is basically the same but there is an extra step where you convert the odds from positive to negative by multiplying -1. So it goes like; negative odds multiplied by -1 divided by the sum of hard +100.

As on this example for -150: it goes as follows: ((-150 * -1) / (-150*-1)+100)) * 100 = 60%

For this Implied Money line there’s also a dedicted Implied money line calculator which can do just that.

Fractional

For fraction, you divide the denominator by the total sum of the denominator together with the numerator and then you multiply your answer by 100. The pattern that can be followed is given as 5/1: 1 / (5+1) * 100 = 16.67%.

How to estimate American Odds

From Decimal

If I want to know how to go from decimal to American odds there are two methods that can be used.

If it’s 2 or more than 2, multiply the decimal odds minus one by 100.

Example for 2.1: (2.1-1) * 100 = +110

Contrary to that if’s below two, multiply -100 by decimal odds minus one.

Example for 1.5: -100 / (1.5-1) = -200

From Fractional

There are two methods to scale fraction to decimal. If the fraction is greater than one, then the numerator is divided by the denominator, then by 100.

For instance, a ratio of 7 to 2 is represented as follows: (7/2) * 100 = +350

If it is below 1/1 then you multiply -100 by the result of the numerator divided by the denominator.

Example of 1/5: -100 / (1/5) = -500

Of Percentages

As always with American odds also with positive and negative odds different formulas work. 50% and more will be positive numbers while lesser than 50% will be negative.

It seems like whether it’s a negative or positive number there’s always some sort of calculation required to work these odds out. Whether it’s a divisional procedure or a percentage adjustment all of it is done to figure out the percentages.

Example for a +400 return: Take +400 and first divide it by the percentage you have worked out. Then in order to aquire a conversion in cents you would take the divide the answer by 100 but make sure to leave the -100 outside the brackets. Therefore last but not the least through out the entire formula -100 needs to be added in order to reach the final answer. So what the answer would now equate to is 100 over (20 divided by -100 times -400)

Example (-150) : 60 percent would now be: The percentage divided with 100 is 1 and as we convert that to a fraction we make it s/100. We now are going o substitute s with 60 serving as the final answer.

Example for A Fractional Odds from a Decimal: It is fairly simple as well if a fraction is being converted into a decimal. First step would always be simply making sure to take 1 away then when its reaching a fraction it is represented as a number. As per the example done of (3): (2) When the old number of (1) subtracts the new number of (3) we find out everything continues becoming quite straightfoward (3).

Example for +300: Once again all we will be doing is diving the total odds by 100 for a positive american number. Which in this case equates to 300: So when we substitute and divide it with 100 will now make it 3/1.

Example for -300: To convert a negative number into a percentage just take 100 and divide it by the negative 150. So with this we gain a final conversion from the percentages into fractions as well.

A 20% = 1 / (20/100) – 1 = 4 out of 1 example lets us prove our point.

Changing to Decimal Odds
From American
When changing the positive American odd to the decimal format, you take the American odds, divide it by one hundred and then add one.
In the case of +250 the equation would be: (250/100) +1 = 2.5
In the case of a negative number, you do the inverse by subtracting one from the hundred divided by the American odds and multiplying the answer by negative 1.
In the case of -250, the equation would be: (100/-250) -1 * -1 = 1.4
To shift from Fractional to Decimal
To shift from the fractional format to the decimal format, you divide the numerator by the denominator and then add one.
In the case of 3/2 the equation would be: 3/2 + 1 = 2.5
Using Implied Percentages
Using the percentage formula of 1/ (percentage)/100 will give the needed decimal odds.
For a 60% example, the intended outcome would be 1/ 60%/100 = 1.67
With hopes, comprehending the various means book owners portray their lines should aid give you a stronghold to exploit opportunities in the future. It could also assist in focusing on ways of increasing your wins.