Use the AllStar’s betting odds conversion table and betting odds conversion calculator below to quickly switch from one odds format to another. Choose your preferred format between American to decimal conversion, fraction to decimal conversion, convert probability to odds and more.
Odds Conversion Calculator
Quick Betting Odds Conversion Lookup Table
Underlying our odds conversion calculator is the following odds conversion table, for converting odds between each of the popular 4 formats.
| Decimal | Fractional | American | Implied Probability |
|---|---|---|---|
| 1.01 | 1/100 | -10000 | 99.01% |
| 1.02 | 1/50 | -5000 | 98.04% |
| 1.03 | 1/33 | -3333 | 97.09% |
| 1.04 | 1/25 | -2500 | 96.15% |
| 1.05 | 1/20 | -2000 | 95.24% |
| 1.06 | 1/16 | -1667 | 94.34% |
| 1.07 | 1/14 | -1429 | 93.46% |
| 1.08 | 1/13 | -1250 | 92.59% |
| 1.09 | 1/11 | -1111 | 91.74% |
| 1.1 | 1/10 | -1000 | 90.91% |
| 1.11 | 1/9 | -909 | 90.09% |
| 1.12 | 2/17 | -833 | 89.29% |
| 1.13 | 2/15 | -769 | 88.5% |
| 1.14 | 1/7 | -714 | 87.72% |
| 1.15 | 2/13 | -667 | 86.96% |
| 1.16 | 2/13 | -625 | 86.21% |
| 1.17 | 1/6 | -588 | 85.47% |
| 1.18 | 2/11 | -556 | 84.75% |
| 1.19 | 2/11 | -526 | 84.03% |
| 1.2 | 1/5 | -500 | 83.33% |
| 1.22 | 2/9 | -455 | 81.97% |
| 1.25 | 1/4 | -400 | 80% |
| 1.28 | 2/7 | -357 | 78.13% |
| 1.3 | 3/10 | -333 | 76.92% |
| 1.33 | 1/3 | -303 | 75.19% |
| 1.35 | 7/20 | -286 | 74.07% |
| 1.36 | 4/11 | -278 | 73.53% |
| 1.4 | 2/5 | -250 | 71.43% |
| 1.44 | 4/9 | -227 | 69.44% |
| 1.45 | 9/20 | -222 | 68.97% |
| 1.47 | 8/17 | -213 | 68.03% |
| 1.5 | 1/2 | -200 | 66.67% |
| 1.53 | 8/15 | -189 | 65.36% |
| 1.57 | 4/7 | -175 | 63.69% |
| 1.6 | 3/5 | -167 | 62.5% |
| 1.62 | 8/13 | -161 | 61.73% |
| 1.63 | 5/8 | -159 | 61.35% |
| 1.66 | 2/3 | -152 | 60.24% |
| 1.7 | 7/10 | -143 | 58.82% |
| 1.72 | 8/11 | -139 | 58.14% |
| 1.8 | 4/5 | -125 | 55.56% |
| 1.83 | 5/6 | -120 | 54.64% |
| 1.9 | 9/10 | -111 | 52.63% |
| 1.91 | 10/11 | -110 | 52.36% |
| 1.95 | 20/21 | -105 | 51.28% |
| 2 | 1/1 | +/-100 | 50% |
| 2.05 | 21/20 | +105 | 48.78% |
| 2.1 | 11/10 | +110 | 47.62% |
| 2.2 | 6/5 | +120 | 45.45% |
| 2.25 | 5/4 | +125 | 44.44% |
| 2.3 | 13/10 | +130 | 43.48% |
| 2.38 | 11/8 | +138 | 42.02% |
| 2.4 | 7/5 | +140 | 41.67% |
| 2.5 | 3/2 | +150 | 40% |
| 2.6 | 8/5 | +160 | 38.46% |
| 2.63 | 13/8 | +163 | 38.02% |
| 2.7 | 17/10 | +170 | 37.04% |
| 2.75 | 7/4 | +175 | 36.36% |
| 2.8 | 9/5 | +180 | 35.71% |
| 2.88 | 15/8 | +188 | 34.72% |
| 2.9 | 19/10 | +190 | 34.48% |
| 3 | 2/1 | +200 | 33.33% |
| 3.1 | 21/10 | +210 | 32.26% |
| 3.13 | 17/8 | +213 | 31.95% |
| 3.2 | 11/5 | +220 | 31.25% |
| 3.25 | 9/4 | +225 | 30.77% |
| 3.3 | 23/10 | +230 | 30.3% |
| 3.38 | 19/8 | +238 | 29.59% |
| 3.4 | 12/5 | +240 | 29.41% |
| 3.5 | 5/2 | +250 | 28.57% |
| 3.6 | 13/5 | +260 | 27.78% |
| 3.75 | 11/4 | +275 | 26.67% |
| 3.8 | 14/5 | +280 | 26.32% |
| 4 | 3/1 | +300 | 25% |
| 4.2 | 16/5 | +320 | 23.81% |
| 4.33 | 10/3 | +333 | 23.09% |
| 4.5 | 7/2 | +350 | 22.22% |
| 4.6 | 18/5 | +360 | 21.74% |
| 5 | 4/1 | +400 | 20% |
| 5.5 | 9/2 | +450 | 18.18% |
| 6 | 5/1 | +500 | 16.67% |
| 6.5 | 11/2 | +550 | 15.38% |
| 7 | 6/1 | +600 | 14.29% |
| 7.5 | 13/2 | +650 | 13.33% |
| 8 | 7/1 | +700 | 12.5% |
| 8.5 | 15/2 | +750 | 11.76% |
| 9 | 8/1 | +800 | 11.11% |
| 9.5 | 17/2 | +850 | 10.53% |
| 10 | 9/1 | +900 | 10% |
| 11 | 10/1 | +1000 | 9.09% |
| 20 | 19/1 | +1900 | 5% |
| 30 | 30/1 | +2900 | 3.33% |
| 40 | 40/1 | +3900 | 2.5% |
| 50 | 50/1 | +4900 | 2% |
| 60 | 60/1 | +5900 | 1.67% |
| 70 | 70/1 | +6900 | 1.43% |
| 80 | 80/1 | +7900 | 1.25% |
| 90 | 90/1 | +8900 | 1.11% |
| 100 | 100/1 | +9900 | 1% |
| 1000 | 1000/1 | +99900 | 0.1% |
How to convert to American Betting Odds
There are different ways that sportsbook can display their odds on an event. In the US, it is common to see American odds. In American odds, the favorite appears with a minus sign and the underdog with a plus sign. The numeral illustrates the extent to which a favorite is favored to win, or an underdog is expected to lose. If you are unfamiliar with how to read American odds, our quick explainer video below is a good place to start.
Converting from Decimal odds to American Odds
When Francis N’Gannou faced Stipe Miocic in the 2021 rematch at UFC 260, he was the betting favorite – priced at 1.71 in decimal odds. Stipe Miocic was a slight underdog at 2.1.
We need two formulas for to work out the American odds for each fighter here.
Converting decimal odds for underdogs to American odds
For the underdog (odds of 2 or above) we use the following formula:
(Decimal Odds - 1) * 100 = American odds
So, working our odds of 2.1 into this formula gives us
(2.1 - 1) * 100 = +110
Converting decimal odds for favorites to American odds
For the favorite (odds of below 2 and greater than 1) we use the following formula:
-100 / (decimal odds - 1) = American odds
So, working our odds of 1.71 into this formula gives us
-100 / (1.71 - 1) = -140
Note, that the formula above actually returns decimal places, but convention for American odds is to round to the nearest whole number, and in some cases, to the nearest 5.
Converting from Fractional odds to American Odds
Let’s convert from Fractional odds into American odds next, using an example from a famous soccer match. The Champions League final in 2021 was contested between Chelsea and Manchester City.
The fractional odds for Chelsea to win the match were 13/4, and for Manchester city the odds were 10/11. To convert this into American odds, we again need two formulas.
You can recognize the favorite by evaluating which of the fractional odds equates to less than 1.
-100 / (Fractional odds) = American odds.
For underdogs, where the fractions are greater than 1 the formula is as follows:
(Fractional odds) * 100 = American odds
Converting from Fractional odds to American Odds for underdogs
We can work out the odds for Chelsea to win in American format using our underdog formula, since the fractional odds of 13/4 equates to 3.25:
3.25 * 100 = +325
Converting from Fractional odds to American Odds for favorites
For Manchester City, we need to use the first formula, since the fractional odds of 10/11 equates to ~0.91.
-100 / (10/11) = -110
How to convert to Decimal Odds
Outside of the US, the standard way to display odds is in Decimal format.
As newcomers to betting, it’s usually considered easier to read Decimal odds because we can deduce the implied probability a little bit easier than American Odds.
Think of this when you’re trying to calculate the value in decimal odds: The odds represent what you would get back, including your stake, if you were to put down a single dollar.
American to Decimal Odds Conversion
Let’s do a simple decimal betting odds calculation as an example. To illustrate, let’s look at the 2nd UFC fight between Conor McGregor and Nate Diaz. McGregor stepped into the Octagon as the -130 favorite. Diaz was the +110 underdog at 2.1.
Here’s the formula to convert from American odds to Decimal odds:
When American odds are positive the formula is:
(American odds / 100) + 1 = decimal odds.
So, Nate Diaz at +110 in American odds can be worked out as:
(110 / 100) + 1 = 2.1
The formula is different when the American odds are negative:
1 - (100 / American odds) = decimal odds.
So, Conor McGregor at -130 in American odds can be worked out as:
1 - (100 / -130) = 1.769
Fraction to Decimal Odds conversion
Let’s do a fraction to decimal odds conversion next, using an example from a famous soccer match. The Champions League final in 2021 was contested between Chelsea and Manchester City.
The fractional odds for Chelsea to win the match were 13/4. To convert this into decimal odds, the formula is simple:
Fractional Odds + 1 = Decimal Odds
So, we can work out the odds for Chelsea to win in Decimal format are:
3.25 + 1 = 4.25
Implied Probability to Decimal Betting Odds Conversion
In the same match, the bookmakers had set the probability of a Manchester City victory at 52.38%. We can work this backwards into Decimal odds using the following formula:
1 / (Implied probability / 100) = Decimal Odds
Let’s work that out:
1 / (52.38 / 100) = 1.91
How to convert to Implied Probability
Oddsmakers at sportsbooks around the globe decide on what price to set odds at based on their estimated probability of any given outcome. This implied probability is converted into various different odds formats, and can be caculated back again easily too.
American odds to Implied Probability Conversion
Let’s look at an example, in a matchup where we have a -150 favorite facing a +130 underdog.
The implied probability for the favourite to win is 60%, and for the underdog it is 43.48%.
Here’s the math behind that calculation.
American odds to Probability converter for favorites
For favorites, where the american odds are negative, take the absolute value of the odds (remove the negative) and calculate using the following formula:
Odds / (Odds + 100) * 100
Using our example above, we have:
150 / (150 + 100) * 100 = 60%
American odds to Probability converter for underdogs
And for underdogs (with positive odds):
100 / (Odds + 100) * 100
Back to our example above, we have:
100 / (130 + 100) * 100 = 43.48%
Now, if you’re wondering how the probability could possibly exceed 100%, then you’re onto something. The reason for that, is explained in more detail over in our article about Vig – which in short, is the margin that the sportsbook takes which allows it to stay in business.
Converting from Decimal odds to Implied Probability
Let’s look at an example, in a matchup where we have a 1.666 favorite facing a 2.3 underdog.
The implied probability for the favourite to win is 60%, and for the underdog it is 43.48%.
Here’s the math behind that calculation.
100 x (1 / Decimal Odds) = Probability %
Let’s work that out with the example above:
100 x ( 1 / 1.667) = 59.98%
Note, the more decimal places used, the higher the accuracy of the implied probability. Which brings us on to conversion from Fractional odds.
Converting from Fractional odds to Implied Probability
Let’s look use the same example from above, where using fractional odds will actually gives a more accurate implied probability than when using rounded decimal odds.
The fractional odds for the favorite are 2/3, and for the underdog, are 13/10.
The implied probability for the favourite to win is 60%, and for the underdog it is 43.48%.
Here’s the math behind that calculation.
100 x (1 / (1 + Fractional Odds)) = Probability %
Let’s work that out with the example above:
100 x (1 / (1 + 2/3)) = 60%
Odds conversion – Quick lookup table
Use the table below for a quick reference of popular betting lines.
| Fractional | Decimal | American Odds | Implied Probability |
|---|---|---|---|
| 1/5 | 1.20 | -500 | 83.3% |
| 2/9 | 1.22 | -450 | 81.8% |
| 1/4 | 1.25 | -400 | 80% |
| 2/7 | 1.29 | -350 | 77.8% |
| 3/10 | 1.30 | -333.3 | 76.9% |
| 1/3 | 1.33 | -300 | 75% |
| 4/11 | 1.36 | -275 | 73.3% |
| 4/9 | 1.44 | -225 | 69.2% |
| 5/4 | 2.25 | 125 | 44.4% |
| 11/8 | 2.38 | 137.5 | 42,1% |
| 9/1 | 10.00 | 900 | 10% |
| 10/1 | 11.00 | 1000 | 9.1% |
| 20/1 | 21.00 | 2000 | 4.8% |
| 50/1 | 51.00 | 5000 | 2% |
| 100/1 | 101.00 | 10000 | 1% |
| 1000/1 | 1001.00 | 100000 | 0.1% |
You can also use our odds conversion calculator at the top of this page.