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Betting Odds Calculator and Odds Converter

Use this free betting odds calculator to convert odds between American, Decimal, Fractional, and Probability formats. You can also enter your stake to calculate potential profit and total return, making this tool both an odds calculator and an odds converter for sports betting.

How to Calculate Betting Odds

To calculate betting odds, you just need the odds, stake, and the math formulas. That allows you to calculate implied probability, potential profit, total return, and convert between any odds format.​​ The formula depends on which odds format you're using.

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American Odds

 

American odds are either positive or negative.

Example: +100, -120

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Formulas for positive American odds:

  • Potential Profit = Stake * (Odds / 100)

  • Total Return = Stake + Potential Profit

  • Implied Probability = 100 / (Odds + 100)

  • Conversion to Decimal = (Odds + 100) / 100

 

Example: $100 at +150

  • Potential Profit = 100 * (150 / 100) = $150

  • Total Return = 100 + 150 = $250

  • Implied Probability = 100 / (150 + 100) = 100 / 250 = 40%

  • Conversion to Decimal = (100 + 100) / 100 = 2.00

 

Formulas for negative American odds:

  • Potential Profit = Stake * (100 / |Odds|)

  • Total Return = Stake + Potential Profit

  • Implied Probability = |Odds| / (|Odds| + 100)

  • Conversion to Decimal = (|Odds| + 100) / |Odds|

 

Example: $150 at -150

  • Potential Profit = 150 * (100 / 150) = $100

  • Total Return = 150 + 100 = $250

  • Implied Probability = 150 / (150 + 100) = 150 / 250 = 60%

  • Conversion to Decimal = (150 + 100) / 150 = 1.67

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Decimal Odds

 

Decimal odds are the easiest format for payout math, so a lot of sharp bettors use them.

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Formulas:

  • ​Total Return = Stake * Decimal Odds

  • Potential Profit = Total Return - Stake

  • Implied Probability = 1 / Decimal Odds

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Example: $100 at 2.50

  • Total Return = 100 * 2.50 = $250

  • Potential Profit = 250 - 100 = $150

  • Implied Probability = 1 / 2.50 = 40%

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Fractional Odds

 

Fractional odds show profit relative to stake.

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Formulas:

  • Potential Profit = Stake * (Numerator / Denominator)

  • Total Return = Stake + Potential Profit

  • Implied Probability = Denominator / (Numerator + Denominator)

 

Example: $100 at 3/2

  • Potential Profit = 100 * (3 / 2) = $150

  • Total Return = 100 + 150 = $250

  • Implied Probability = 2 / (3 + 2) = 2 / 5 = 40%

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How Much Does a Bet Pay?

 

How much a bet pays depends on the odds and your stake.

 

There are two payout amounts to think about:

  • Potential profit is how much you win, excluding your stake

  • Total return is how much you get back in total, including your stake

 

For example, if you bet $100 at +200, the math is:

  • Potential Profit = 100 * (200 / 100) = $200

  • Total Return = 100 + 200 = $300

 

If you bet $100 at -110, the math is:

  • Potential Profit = 100 * (100 / 110) = $90.91

  • Total Return = 100 + 90.91 = $190.91

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Betting odds calculators give you quick answers for odds conversions and payouts without having to do the math by hand or in your head.

Betting Odds Calculator FAQ

What is a betting odds calculator?

  • A betting odds calculator is a tool that helps you understand prices and payouts. They usually convert between different odds formats (American, Decimal, Fractional, probability, etc.) and also show potential profit and payouts.​

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How do you calculate betting odds?

  • To calculate betting odds, you start with the sportsbook’s price and your stake. That gives you:

    • The implied probability of the bet

    • The potential profit if the bet wins

    • The total return, which is the stake + win amount

  • A betting odds calculator makes the process automatic so you don't have to do it by hand.

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How much does a bet pay?

  • How much a bet pays depends on the odds and the amount staked.

  • A betting odds calculator can show payouts in different ways:

    • Potential profit: how much you win excluding your original stake

    • Total return: how much you get back including your original stake

    • For example, if you bet $100 at +150, your potential profit is $150 and your total return is $250.

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How do you convert betting odds?

  • An odds converter translates one odds format into another.

  • For example, a betting odds calculator can convert:

    • American odds to Decimal odds

    • American odds to Fractional odds

    • American odds to Probability

    • Decimal odds to American odds

    • Fractional odds to American odds

  • Converting to a familiar format, or a format that's commonly used by another source, makes it easier to compare apples to apples.

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What is implied probability in sports betting?

  • Implied probability is the term for odds translated into probability.

  • For example:

    • +200 = 33.33% implied probability

    • -200 = 66.67% implied probability

    • 2.00 decimal odds = 50.00% implied probability

  • Converting odds to probability lets you compare to your own win probability estimate.

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What's the difference between a betting odds calculator and an odds converter?

  • An odds converter translates odds from one format to another, like American to Decimal.

  • A betting odds calculator does more. It usually converts odds, but it also gives you potential profit and return.

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Why should I use a betting odds calculator?

  • A betting odds calculator helps you make faster and better betting decisions by showing exactly what a line means.

  • You can use it to convert odds formats so you can compare apples to apples, or calculate profit and return before betting.

Learn More About Betting Calculators

Check Out These Articles on a Range of Sports Betting Math Topics

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