Understanding betting odds is essential before placing any wager because the odds tell you more than whether a selection is favored or an underdog. They also determine how much profit a winning bet could generate and provide an implied probability that can help you interpret the market price.

The FanDuel Odds Calculator is designed to make American odds easier to understand. Enter the American odds and your bet amount, and the calculator provides four useful results: implied probability, potential profit, total payout, and decimal odds. Instead of performing each calculation manually, you can get the figures in seconds.

This calculator is particularly useful for people who regularly encounter American betting odds such as +150, +200, -110, or -200. By converting those odds into probability and decimal format while calculating the potential financial return, the tool provides a convenient way to understand what a particular price means before making a betting decision. The calculations are mathematical estimates based on the odds and stake you enter and do not predict whether a bet will win.

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What Is a FanDuel Odds Calculator?

A FanDuel odds calculator is a tool for interpreting American-style betting odds and determining the potential financial outcome of a wager.

The calculator requires two inputs:

1. American Odds
2. Bet Amount

For example, you might enter +150 as the American odds and $50 as the bet amount.

The calculator then determines:

• Implied probability
• Potential profit
• Total payout
• Decimal odds

These results help translate the American odds format into numbers that may be easier to understand.

The calculator works with both positive and negative American odds. Positive odds generally represent an underdog or a selection that returns a specified profit relative to a $100 stake. Negative odds generally represent a favorite and show how much you would need to risk to make $100 in profit.

It is important to remember that American odds describe the pricing of a wager. They do not guarantee an outcome.

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How to Use the FanDuel Odds Calculator

Using the calculator is straightforward.

Step 1: Enter the American Odds

Enter the odds displayed for the wager.

Examples include:

• +100
• +125
• +150
• +200
• -105
• -110
• -150
• -200

The calculator accepts positive or negative American odds, but an odds value of zero is not valid.

Make sure you enter the odds exactly as displayed. The plus or minus sign is important because positive and negative American odds use different formulas.

Step 2: Enter Your Bet Amount

Enter the amount you intend to stake.

For example:

Bet Amount = $50

The calculator accepts decimal amounts, so you can enter values such as $10, $25.50, $50, or $100.

The bet amount must be greater than zero.

Step 3: Click Calculate

After entering both values, select Calculate.

The tool will display the calculated:

• Implied Probability
• Potential Profit
• Total Payout
• Decimal Odds

Step 4: Review the Results

The results section lets you see the relationship between the odds and your selected stake.

If you want to perform another calculation, you can replace the inputs and calculate again. The Reset option reloads the calculator so you can start over.

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Understanding American Betting Odds

American odds, also called moneyline odds, are commonly displayed with a plus or minus sign.

Positive American Odds

Positive odds such as +150 indicate the potential profit on a $100 stake.

At +150:

• A $100 stake produces $150 profit.
• The original $100 stake is returned separately.
• Total payout = $250.

If your stake is smaller or larger than $100, the potential profit changes proportionally.

For example, a $20 stake at +150 would generate:$$20 \times \frac{150}{100} = \$30$$

The total payout would be:$$\$20 + \$30 = \$50$$

Negative American Odds

Negative odds such as -150 indicate how much you need to risk to make $100 in profit.

At -150:

• A $150 stake produces $100 profit.
• The original $150 stake is also returned.
• Total payout = $250.

If you stake $30 instead:$$30 \times \frac{100}{150} = \$20$$

The total payout would be:$$\$30 + \$20 = \$50$$

This distinction between positive and negative odds is fundamental when interpreting American betting prices.

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FanDuel Odds Calculator Formula Explained

The calculator uses different formulas depending on whether the American odds are positive or negative.

Positive Odds Formula

For positive American odds:

Implied Probability

$$Implied\ Probability = \frac{100}{Odds+100}$$

The result is converted into a percentage.

For example, at +150:$$\frac{100}{150+100} = \frac{100}{250} = 0.40$$

Converting to a percentage:$$0.40 \times 100 = 40\%$$

So +150 has an implied probability of 40% under the standard American-odds conversion.

Decimal Odds

For positive odds:$$Decimal\ Odds = \frac{Odds}{100}+1$$

At +150:$$\frac{150}{100}+1=2.50$$

Therefore, +150 corresponds to 2.50 decimal odds.

Potential Profit

For positive odds:$$Profit = Stake \times \frac{Odds}{100}$$

For a $50 stake at +150:$$50 \times \frac{150}{100}=\$75$$

The potential profit is $75.

Total Payout

$$Total\ Payout = Stake + Profit$$

Therefore:$$\$50+\$75=\$125$$

The total payout is $125.

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Negative Odds Formula

Negative American odds use a different calculation.

Implied Probability

For negative odds:$$Implied\ Probability = \frac{|Odds|}{|Odds|+100}$$

The absolute value is used so the calculation works with the negative number.

For -200:$$\frac{200}{200+100} = \frac{200}{300} = 0.6667$$

Therefore:$$0.6667 \times 100 \approx 66.67\%$$

The implied probability is approximately 66.67%.

Decimal Odds

For negative odds:$$Decimal\ Odds = \frac{100}{|Odds|}+1$$

At -200:$$\frac{100}{200}+1=1.50$$

Therefore, -200 corresponds to 1.50 decimal odds.

Potential Profit

For negative odds:$$Profit = Stake \times \frac{100}{|Odds|}$$

For a $50 stake at -200:$$50 \times \frac{100}{200}=\$25$$

The potential profit is $25.

Total Payout

$$Total\ Payout = Stake + Profit$$

Therefore:$$\$50+\$25=\$75$$

The total payout would be $75.

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Example 1: Positive Odds

Suppose the American odds are +150 and the bet amount is $100.

Implied Probability

$$\frac{100}{150+100}=40\%$$

Potential Profit

$$100 \times \frac{150}{100}=\$150$$

Total Payout

$$100+150=\$250$$

Decimal Odds

$$\frac{150}{100}+1=2.50$$

The results are:

Result	Value
American Odds	+150
Bet Amount	$100
Implied Probability	40.00%
Potential Profit	$150.00
Total Payout	$250.00
Decimal Odds	2.50

This illustrates how a positive American price translates into a larger potential profit relative to the stake.

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Example 2: Negative Odds

Now consider -200 odds with a $100 bet.

Implied Probability

$$\frac{200}{200+100}=66.67\%$$

Potential Profit

$$100\times\frac{100}{200}=\$50$$

Total Payout

$$100+50=\$150$$

Decimal Odds

$$\frac{100}{200}+1=1.50$$

The results are:

Result	Value
American Odds	-200
Bet Amount	$100
Implied Probability	66.67%
Potential Profit	$50.00
Total Payout	$150.00
Decimal Odds	1.50

The example shows why negative odds generally produce less profit relative to the stake than positive odds.

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Example 3: A Smaller Bet at +250

Suppose the odds are +250 and the stake is $20.

The potential profit is:$$20\times\frac{250}{100}=\$50$$

Total payout:$$20+50=\$70$$

Implied probability:$$\frac{100}{250+100} = 28.57\%$$

Decimal odds:$$\frac{250}{100}+1=3.50$$

Therefore, the calculator would show approximately:

• Implied Probability: 28.57%
• Potential Profit: $50.00
• Total Payout: $70.00
• Decimal Odds: 3.50

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Implied Probability Explained

Implied probability is one of the most useful figures produced by an odds calculator.

It represents the probability implied by the quoted American odds, rather than a guarantee that the event will occur.

For example:

• +100 = 50.00%
• +200 = 33.33%
• +300 = 25.00%
• -100 = 50.00%
• -150 = 60.00%
• -200 = 66.67%

As positive odds become larger, the implied probability becomes smaller.

As negative odds become more negative, the implied probability becomes larger.

Important: Implied Probability Is Not a Prediction

A 60% implied probability does not mean the selection will definitely win 60 out of the next 100 times. It is a mathematical interpretation of the quoted odds.

Actual sportsbook prices can also incorporate a margin, commonly called the vig, juice, or overround. As a result, comparing implied probabilities across a complete market requires additional consideration.

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Potential Profit vs. Total Payout

These two terms are often confused.

Potential Profit

Potential profit is the amount you would gain above your original stake if the wager wins.

For example, if you bet $50 and receive $75 in profit, your profit is $75.

Total Payout

Total payout includes both your original stake and the profit.

Therefore:$$Total\ Payout = Stake + Profit$$

Using the same example:$$\$50+\$75=\$125$$

So:

• Profit = $75
• Total payout = $125

Understanding this difference prevents confusion when comparing possible returns.

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American Odds vs. Decimal Odds

American odds and decimal odds communicate the same underlying price in different formats.

American Odds	Decimal Odds	Implied Probability
+100	2.00	50.00%
+150	2.50	40.00%
+200	3.00	33.33%
+250	3.50	28.57%
-100	2.00	50.00%
-110	1.91	52.38%
-150	1.67	60.00%
-200	1.50	66.67%

Decimal odds are useful because the total return from a winning stake can be represented by multiplying the stake by the decimal odds.

For example:$$\$50\times2.50=\$125$$

At +150, the equivalent decimal odds are 2.50, producing a total payout of $125 on a $50 stake.

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Why Use a FanDuel Odds Calculator?

Quick Calculations

You can calculate the potential return without manually applying separate formulas for positive and negative odds.

Easy Probability Conversion

American odds can be less intuitive for people who are more familiar with percentages. The calculator converts them into implied probability.

Multiple Formats

The tool provides both American and decimal interpretations, allowing you to compare the same price using different odds formats.

Flexible Bet Amounts

You can enter the specific amount you are considering rather than relying on a standard $100 example.

Useful for Comparison

If you are reviewing multiple prices, calculating each one can help you understand how the odds differ in terms of potential return and implied probability.

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Tips for Understanding Betting Odds

Always Check the Sign

A plus sign and minus sign fundamentally change the calculation. +150 and -150 are not equivalent prices.

Separate Profit From Payout

Remember that payout includes your original stake, while profit represents the amount earned beyond that stake.

Don’t Treat Probability as Certainty

Implied probability describes the mathematical relationship represented by the odds. It is not a guarantee of an outcome.

Compare Equivalent Formats

Converting American odds to decimal odds can make comparisons easier when you are accustomed to decimal pricing.

Consider the Full Market

A single implied probability does not tell the entire story. When evaluating a market, the prices of all relevant selections and the bookmaker’s margin can matter.

Use a Fixed Budget

Before placing any wagers, establish an amount you can afford to lose and avoid treating potential winnings as guaranteed income.

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Common American Odds Examples

Here are some common prices and their approximate mathematical interpretations:

American Odds	Implied Probability	Decimal Odds
+100	50.00%	2.00
+125	44.44%	2.25
+150	40.00%	2.50
+200	33.33%	3.00
+300	25.00%	4.00
-110	52.38%	1.91
-125	55.56%	1.80
-150	60.00%	1.67
-200	66.67%	1.50
-300	75.00%	1.33

Values are rounded for presentation.

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Frequently Asked Questions

1. What is the FanDuel Odds Calculator used for?

The calculator converts American odds into implied probability and decimal odds while calculating potential profit and total payout for a selected bet amount.

2. How do I calculate profit from positive American odds?

For positive odds, multiply the stake by the odds divided by 100. For example, a $50 stake at +150 produces $75 in potential profit.

3. How do I calculate profit from negative American odds?

For negative odds, multiply the stake by 100 divided by the absolute value of the odds. For example, a $50 stake at -200 produces $25 in potential profit.

4. What does implied probability mean?

Implied probability is the percentage represented by the mathematical conversion of the quoted odds. It does not guarantee that the selection will win or accurately predict a future result.

5. What is the difference between payout and profit?

Profit is the amount earned above the original stake. Total payout includes both the original stake and the potential profit.

6. What are decimal odds?

Decimal odds express the total return relative to the stake. For example, decimal odds of 2.50 mean a $50 winning stake would produce a $125 total payout before considering any applicable rules or adjustments.

7. Can I use any bet amount?

Yes. You can enter different positive stake amounts, including amounts with cents. The potential profit and payout are calculated based on the amount entered.

8. Why do positive and negative odds use different formulas?

American odds use positive numbers to indicate the potential profit from a $100 stake and negative numbers to indicate the amount that must be risked to make $100. Therefore, the mathematical conversions are different.

9. Does the calculator guarantee my potential winnings?

No. The calculator only performs mathematical calculations based on the odds and stake entered. It cannot predict whether a wager will win.

10. Does implied probability include the sportsbook’s margin?

The basic implied probability calculation comes directly from the displayed odds. In a complete betting market, the prices can include a bookmaker’s margin, so individual implied probabilities should not automatically be interpreted as fair probabilities.

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Conclusion

The FanDuel Odds Calculator provides a convenient way to understand American betting odds without performing the calculations manually. By entering American odds and a bet amount, you can quickly see implied probability, potential profit, total payout, and equivalent decimal odds.

Knowing how to interpret positive and negative American odds is particularly important. Positive odds show the potential profit on a $100 stake, while negative odds show how much must be risked to earn $100 in profit. The calculator automatically applies the appropriate formula based on the sign of the odds.

Use the tool as a mathematical reference when reviewing betting prices and potential returns. Keep in mind that calculated probability and potential payout do not guarantee results, and responsible wagering means understanding the risks and only using money you can afford to lose.