Odds To Percentage Calculator

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

• Convert Percentage To Odds
• Odds To Percentage Calculator
• Odds To Percent

Convert Percentage To Odds

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

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:

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%

How to convert fraction betting odds

Fraction betting odds are easier to convert into an implied winning 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

Odds To Percentage Calculator

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

How to convert decimal betting odds

Decimal odds are the easiest to convert into a percentage.

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

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%.

Have you ever wondered what the chances of a team winning was based off of the money line for the game? That’s a key part of understanding money line bets. First, we have a simple calculator that you can use to plug in any moneyline (American style odds) and quickly get the fair market probability that it implies. We’ve also included a chart below the calculator for reference, and to see how favorites and underdogs compare.

Money Line Calculator (Implied Probability)

The following chart shows how likely a team is to win based off the odds. This is helpful in handicapping because you can see just what percentage of your wagers you need to win at each given money line in order to profit.

The left chart is to be used for favorites, the right for underdogs.

Win % – Percentage of wins required to show a profit at a given money line.

For example, you would need to win 80% of all of your bets just to break even if you only bet on -400 money line favorites (over 80% to turn a profit).

Moneyline Conversion: Odds to Percentage Chart

Odds To Percent

Spread to Moneyline by Sport Conversion