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Odds Converter Percentage

Sorry, but there's a bit of math involved when it comes to calculating sports betting value.(Photo credit: DonkeyHotey / Foter / CC BY)

Being able to convert betting odds into percentages is a major part of knowing how to read odds.

Odds Converter Percentage

Equation: (numerator/denominator) + 1 = decimal odds Example: 6/5 is equal to 2.20. This equals 1.20. Add 1, and you had the decimal 2.20. How To Convert Decimal Odds To Fractional. There are two steps to convert decimal odds into a fraction. Step 1) Convert decimals odds into a fraction by subtracting 1, and using 1 as the. Thus, an odds ratio of.75 translates into a failure rate of 15.8% in the treatment group relative to an assumed failure rate of 20% in the control group. This translation of odds ratios into an easily understand metric is commonly used in meta-analyses of odds ratios. For example, the exact mathematical equivalent of decimal odds 30 is fractional odds 29/1. However 29/1 is not used in betting markets, instead 30/1 is used, so that is what appears in this converter. For an explanation of the odds types on this table see decimal, fractional and American odds. Odds Conversion Calculator. Poker Odds Calculator Binomial Coefficient Calculator Conversion Calculator Poker Odds Chart Instructions About. Fill out one of the values, the other two will populate. Probability: Percentage: Odds::1.

By knowing the percentage of the time you need to win a bet to break even, you can decide whether it is a smart bet to make. If you believe something has an 80% chance of occurring but the odds suggest it has a 50% chance of occurring, you have a positive expectation wager. If you believe something has an 80% chance of occurring but the odds suggest it has an 85% chance of occurring, it’s a bad bet to make because you have no edge.

Below are the formulas to convert moneyline betting odds to percentages, convert fraction betting odds to percentages, and convert decimal betting odds to percentages.

How to convert moneyline betting odds

Moneylines can come in ‘plus’ (favourites) and ‘minus’ (underdogs) formats, so there are two different formulas to convert moneylines into percentages.

For ‘plus’ moneylines, the formula is: 100 / (Moneyline + 100)

If the moneyline is +110, the formula would look like this:

Odds Ratio To Percentage Calculator

100 / (110+100) = 100/210 = 0.476

Multiply your end result (0.476) by 100 to get the percentage: 47.6%

For ‘minus’ moneylines, the formula is: Moneyline / -(100 – (Moneyline))

If the moneyline is -130, the equation would look like this:

-130/ – (-130 -(-100)) = -130 / -230 = 130/230 = 0.565

Multiply your end result (0.565) by 100 to get the percentage: 56.5%

Odds

How to convert fraction betting odds

Fraction betting odds are easier to convert into an implied winning percentage.

Odds Converter To Percentage

For fraction betting odds, the formula is: Denominator / (Denominator + Numerator)

If the fraction betting odds are 11/10, the formula would look like this:

10 / (11+10) = 10 / 21 = 0.4761904

Multiply your end result (0.4761904) by 100 to get the percentage: 47.6%.

How to convert decimal betting odds

Odds

Odds Ratio To Percentage Converter

Decimal odds are the easiest to convert into a percentage.

For decimal betting odds, the formula is: 1 / decimal odds

Odds Converter Percentage

If the decimal betting odds are 2.10, the equation would look like this:
1 / 2.10 = 0.4761904

Multiple your end result (0.4761904) by 100 to get the percentage: 47.6%.