A DraftKings Parlay Calculator can make it much easier to estimate the potential outcome of a parlay before placing a wager. Parlays combine multiple selections, or “legs,” into one bet. Every leg must be successful for the parlay to win, and the combined odds determine the potential payout.
DraftKings Parlay Calculator
Calculating parlay odds manually can become confusing, especially when different legs have different American odds. Our DraftKings Parlay Calculator simplifies the process by allowing you to enter your bet amount and the American odds for two to eight individual legs. The calculator then combines those odds and estimates the potential profit, total payout, implied probability, and combined American odds.
The tool accepts familiar American odds such as -110, +150, +200, or -200. It converts each selection into decimal odds, multiplies the decimal odds together, and then converts the combined result back into American odds.
You can also use the calculator to understand how adding more legs changes a parlay. While adding selections can substantially increase the potential payout, it also means every individual selection must win. Understanding both the potential return and implied probability is therefore important when evaluating a parlay.
This guide explains how the DraftKings Parlay Calculator works, how to enter your odds, the formulas behind the calculations, worked examples, and important concepts to understand when interpreting the results.
What Is a Parlay?
A parlay is a single wager that combines two or more individual selections into one bet. Each selection is commonly called a leg.
For example, a three-leg parlay could contain:
- Leg 1: Team A at -110
- Leg 2: Team B at +150
- Leg 3: Team C at -120
All three selections must win for the parlay to win.
The potential payout is calculated using the combined odds of all the legs rather than treating each selection as a separate bet.
A parlay can therefore produce a substantially larger potential payout than a straight wager for the same initial stake, but the probability of successfully completing the entire combination is also lower because every leg has to succeed.
What Does the DraftKings Parlay Calculator Do?
The calculator is designed to estimate the mathematical outcome of a parlay using the American odds you enter.
It accepts:
- A bet amount
- At least two parlay legs
- Up to eight parlay legs
- Positive American odds
- Negative American odds
The first three legs are required, while the calculator actually requires at least two filled legs and allows additional legs to be left blank. This makes the tool useful for two-leg parlays as well as larger combinations.
After calculation, the tool displays:
| Result | What It Means |
|---|---|
| Number of Legs | Number of odds selections entered |
| Combined Decimal Odds | Combined odds after multiplying each leg |
| Combined American Odds | Combined result converted back to American format |
| Implied Probability | Mathematical implied probability of the combined decimal odds |
| Potential Profit | Estimated winnings above the original stake |
| Total Payout | Original stake plus potential profit |
The calculator is an estimation tool. Actual sportsbook results can differ because of promotional offers, odds boosts, rounding, and sportsbook-specific rules.
How to Use the DraftKings Parlay Calculator
Using the calculator is straightforward.
Step 1: Enter Your Bet Amount
Enter the amount you want to use for the parlay.
For example:
Bet Amount = $25
The calculator uses this amount as the stake when calculating potential profit and total payout.
Step 2: Enter the First Parlay Leg
Enter the American odds for your first selection.
For example:
Leg 1 = -110
American odds can be positive or negative.
Step 3: Enter the Second Leg
Enter the odds for your second selection.
For example:
Leg 2 = +150
At least two legs are required for the calculator to produce a parlay calculation.
Step 4: Add More Legs if Needed
The calculator provides fields for up to eight legs.
Legs 4 through 8 are optional. If you are calculating a two-leg, three-leg, four-leg, or other smaller parlay, simply leave the unused fields blank.
For example, an eight-leg parlay could contain:
- -110
- +120
- -105
- +150
- -130
- +110
- +125
- -115
The calculator combines all valid entries.
Step 5: Click Calculate
After entering the stake and odds, click Calculate.
The calculator determines the number of legs, combined decimal odds, combined American odds, implied probability, potential profit, and total payout.
Step 6: Review the Results
The results section provides a breakdown of the estimated parlay.
Pay particular attention to Potential Profit and Total Payout.
Potential profit does not include the original stake, while total payout includes the original stake.
Understanding American Odds
The calculator uses American odds, a format commonly displayed for sports betting in the United States.
American odds can be either positive or negative.
Positive American Odds
Positive odds indicate how much profit a $100 stake would generate.
For example:
+150
means a $100 stake would produce $150 in profit, resulting in a $250 total return if the wager wins.
Negative American Odds
Negative odds indicate how much you need to stake to make $100 in profit.
For example:
-110
means a $110 stake would produce $100 in profit, assuming the wager wins.
These interpretations are useful for understanding individual selections, but parlay calculations require the odds to be mathematically combined.
Converting American Odds to Decimal Odds
The calculator first converts each American odds value into decimal odds.
For positive American odds, the formula is:
Decimal Odds = 1 + (American Odds ÷ 100)
For example, if the odds are +150:
Decimal Odds = 1 + (150 ÷ 100)
Decimal Odds = 2.50
For negative American odds, the formula is:
Decimal Odds = 1 + (100 ÷ |American Odds|)
The vertical bars mean the absolute value of the negative odds.
For example, for -110:
Decimal Odds = 1 + (100 ÷ 110)
Decimal Odds ≈ 1.9091
Therefore:
-110 ≈ 1.91 decimal odds
The calculator performs this conversion automatically for every entered leg.
How Parlay Odds Are Calculated
Once each American odds value has been converted into decimal odds, the calculator multiplies them together.
The basic formula is:
Combined Decimal Odds = Decimal Odds₁ × Decimal Odds₂ × Decimal Odds₃ × …
For a three-leg parlay:
Combined Decimal Odds = D₁ × D₂ × D₃
where each D represents the decimal odds for one leg.
For example:
- Leg 1 = -110 → approximately 1.9091
- Leg 2 = +150 → 2.50
- Leg 3 = -120 → approximately 1.8333
The combined decimal odds are:
1.9091 × 2.50 × 1.8333 ≈ 8.75
So the parlay’s combined decimal odds are approximately 8.75.
Potential Payout Formula
Once the combined decimal odds are known, the total payout is calculated by multiplying the stake by the combined decimal odds.
The formula is:
Total Payout = Bet Amount × Combined Decimal Odds
For example, if the stake is $25 and combined decimal odds are 8.75:
$25 × 8.75 = $218.75
The estimated total payout is therefore $218.75.
This amount includes the original $25 stake.
Potential Profit Formula
Potential profit is different from total payout.
The formula is:
Potential Profit = Total Payout − Bet Amount
Using the previous example:
$218.75 − $25 = $193.75
Therefore:
- Bet amount = $25
- Potential profit = $193.75
- Total payout = $218.75
This distinction is important when interpreting calculator results.
Combined American Odds Formula
The calculator also converts the combined decimal odds back into American odds.
If the combined decimal odds are 2.00 or greater, the formula is:
American Odds = (Decimal Odds − 1) × 100
For example:
2.50 decimal odds
becomes:
(2.50 − 1) × 100 = +150
If the combined decimal odds are below 2.00, the formula is:
American Odds = -100 ÷ (Decimal Odds − 1)
For example, if the combined decimal odds are 1.50:
-100 ÷ (1.50 − 1) = -200
This allows the calculator to present the combined parlay in the same American odds format used for the individual legs.
Implied Probability Explained
The calculator also provides an implied probability based on the combined decimal odds.
The formula is:
Implied Probability = (1 ÷ Decimal Odds) × 100
For example, if the combined decimal odds are 4.00:
(1 ÷ 4.00) × 100 = 25%
The implied probability is therefore 25%.
If combined decimal odds are 8.00:
(1 ÷ 8.00) × 100 = 12.50%
The larger the decimal odds, the lower the implied probability represented by those odds.
It is important to understand that this is a mathematical conversion of the entered odds. It should not be interpreted as a guarantee that a particular parlay has exactly that real-world chance of winning.
DraftKings Parlay Calculator Example
Suppose you want to calculate a three-leg parlay with:
- Bet amount: $20
- Leg 1: -110
- Leg 2: +150
- Leg 3: +120
First, convert each selection into decimal odds.
Leg 1: -110
1 + (100 ÷ 110) = 1.9091
Leg 2: +150
1 + (150 ÷ 100) = 2.50
Leg 3: +120
1 + (120 ÷ 100) = 2.20
Now multiply the three decimal values:
1.9091 × 2.50 × 2.20 ≈ 10.50
The combined decimal odds are approximately:
10.50
Now calculate the payout:
$20 × 10.50 = $210.00
Potential profit:
$210.00 − $20 = $190.00
The approximate implied probability is:
1 ÷ 10.50 × 100 ≈ 9.52%
So the estimated results are approximately:
| Result | Value |
|---|---|
| Bet Amount | $20 |
| Number of Legs | 3 |
| Combined Decimal Odds | 10.50 |
| Approx. Combined American Odds | +950 |
| Implied Probability | 9.52% |
| Potential Profit | $190.00 |
| Total Payout | $210.00 |
Actual displayed values can vary slightly because of rounding.
Two-Leg Parlay Example
Consider a two-leg parlay:
- Stake = $50
- Leg 1 = -110
- Leg 2 = -110
Each -110 selection converts to approximately:
1.9091 decimal odds
Multiply the two:
1.9091 × 1.9091 ≈ 3.6446
With a $50 stake:
$50 × 3.6446 ≈ $182.23
Potential profit:
$182.23 − $50 = $132.23
The implied probability based on the combined decimal odds is approximately:
27.44%
This example shows how even two selections can produce significantly different potential returns from the original stake.
How Adding More Legs Changes a Parlay
One of the most important concepts in parlay betting is that every additional leg affects the combined odds.
Suppose each selection has decimal odds of approximately 1.91.
| Number of Legs | Approx. Combined Decimal Odds |
|---|---|
| 2 | 3.65 |
| 3 | 6.96 |
| 4 | 13.29 |
| 5 | 25.38 |
| 6 | 48.47 |
| 7 | 92.57 |
| 8 | 176.81 |
These are mathematical examples using the same approximate decimal odds for every leg.
As more legs are added, the potential payout can increase dramatically. However, the parlay also requires every selection to succeed.
This is why a larger potential payout should not be viewed independently from the probability of winning.
Potential Profit vs. Total Payout
These two calculator results are often confused.
Potential Profit
Potential profit represents the amount gained above the original stake.
If you wager $10 and receive a $35 total payout:
Profit = $35 − $10 = $25
Total Payout
Total payout includes both the original stake and the profit:
Total Payout = $35
So:
| Term | Amount |
|---|---|
| Original Bet | $10 |
| Potential Profit | $25 |
| Total Payout | $35 |
Understanding this difference makes the calculator results easier to interpret.
Why Parlay Odds Increase Quickly
Parlay odds are multiplicative rather than additive.
If two selections have decimal odds of 2.00 each:
2.00 × 2.00 = 4.00
Add a third selection at 2.00:
4.00 × 2.00 = 8.00
A fourth selection produces:
8.00 × 2.00 = 16.00
This compounding effect explains why adding several legs can create large potential payouts.
However, the chance that every individual outcome succeeds also decreases as more independent selections are combined.
Common American Odds Examples
The following table provides examples of common American odds and their approximate decimal equivalents.
| American Odds | Approx. Decimal Odds | Approx. Implied Probability |
|---|---|---|
| +100 | 2.00 | 50.00% |
| +150 | 2.50 | 40.00% |
| +200 | 3.00 | 33.33% |
| +250 | 3.50 | 28.57% |
| +300 | 4.00 | 25.00% |
| -100 | 2.00 | 50.00% |
| -110 | 1.91 | 52.38% |
| -120 | 1.83 | 54.55% |
| -150 | 1.67 | 60.00% |
| -200 | 1.50 | 66.67% |
These implied probabilities are mathematical conversions and do not necessarily represent a bettor’s actual probability assessment.
Tips for Using a Parlay Calculator
Double-Check Your Odds
American odds can be easy to mistype. Enter each leg carefully and make sure the positive or negative sign is correct.
For example:
+150 and -150 are completely different odds.
Enter the Correct Stake
Your bet amount directly affects the potential profit and total payout. A larger stake produces a larger dollar return for the same odds, while a smaller stake produces a smaller return.
Use Only Valid Odds
The calculator does not accept zero as a valid American odds value. Every filled leg must contain a valid nonzero odds number.
Start With Two Legs
If you are checking a simple parlay, only enter the selections you actually want to evaluate. Additional fields can remain empty.
Compare Different Combinations
You can use the calculator to compare how changing one leg affects the combined odds, potential profit, and implied probability.
This can be useful for understanding the mathematical effect of different selections.
What the Calculator Does Not Account For
The calculator estimates results from the American odds you provide. Actual sportsbook payouts can vary.
Factors that may affect the final displayed payout include:
- Promotional offers
- Odds boosts
- Rounding
- Special parlay promotions
- Sport-specific rules
- Market-specific rules
- Changes in odds
- Void or postponed selections
- Other sportsbook-specific conditions
Therefore, the calculator should be treated as an odds and payout estimation tool, not a guarantee of the final amount that any sportsbook will pay.
Why Implied Probability Is Useful
Potential payout alone does not tell you how difficult a parlay is to win.
For example, a parlay with very high combined odds may offer a large theoretical payout from a small stake, but its implied probability can be relatively low.
The calculator provides implied probability so you can view the potential return alongside a mathematical probability representation.
This can encourage a more complete evaluation of a parlay rather than focusing only on the possible payout.
Remember that implied probability derived from sportsbook odds can incorporate pricing factors and does not necessarily represent a precise objective probability of an event occurring.
Responsible Use of Betting Calculators
A calculator can explain the mathematics of a wager, but it cannot predict whether the individual selections will win.
Before placing any wager, consider your budget and only use money you can afford to lose. A larger potential payout does not mean a higher likelihood of winning.
Parlays can be particularly volatile because one unsuccessful leg can cause the entire combination to lose. Increasing the number of legs can make the potential payout larger while also making the complete combination harder to hit.
Use the calculator primarily to understand the numbers, compare scenarios, and make informed mathematical decisions rather than assuming a calculated payout represents a likely outcome.
If gambling stops being recreational or begins causing financial or personal problems, consider taking a break and seeking appropriate support.
Frequently Asked Questions
1. What is a DraftKings Parlay Calculator?
A DraftKings Parlay Calculator is a tool that combines the American odds of multiple parlay legs and estimates the resulting decimal odds, American odds, implied probability, potential profit, and total payout for a selected bet amount.
2. How many legs can I enter?
This calculator supports up to eight parlay legs. At least two legs must be entered to calculate a parlay. The fourth through eighth legs are optional.
3. Can I enter both positive and negative American odds?
Yes. The calculator accepts both positive and negative American odds, such as +150 and -110, and converts each value into decimal odds before combining them.
4. How are parlay odds calculated?
The calculator converts every American odds value into decimal odds and multiplies the decimal values together. The resulting decimal number represents the combined parlay odds.
5. What is the difference between potential profit and total payout?
Potential profit is the amount earned above the original stake. Total payout includes both the original stake and the potential profit.
For example, a $20 stake producing a $60 total payout has a potential profit of $40.
6. How is implied probability calculated?
The calculator uses:
Implied Probability = (1 ÷ Combined Decimal Odds) × 100
It represents the mathematical probability implied by the combined decimal odds.
7. Does the calculator guarantee the actual sportsbook payout?
No. It provides an estimate based on the American odds entered. Actual sportsbook payouts may differ because of promotions, boosts, rounding, changing odds, or sportsbook-specific rules.
8. Can I calculate a two-leg parlay?
Yes. The calculator requires at least two filled legs, so it can be used for two-leg parlays as well as larger combinations.
9. Why does adding another leg increase the potential payout?
Parlay decimal odds are multiplied together. Adding another leg therefore multiplies the existing combined odds by the new leg’s decimal odds, potentially increasing the theoretical payout substantially.
However, the entire parlay must succeed, so additional legs also increase the difficulty of winning the combination.
10. Can this calculator predict whether my parlay will win?
No. The calculator performs mathematical calculations using the odds you enter. It does not predict sports results or guarantee that any selection will win. The implied probability is an odds-based mathematical measure, not a prediction.
Final Thoughts
The DraftKings Parlay Calculator provides a convenient way to understand the mathematics behind multi-leg parlays. Instead of manually converting each American odds value and multiplying several decimal numbers, you can enter your bet amount and individual selections and quickly view the combined results.
The calculator supports between two and eight legs and works with both positive and negative American odds. It calculates combined decimal odds, converts them back into American odds, estimates implied probability, and separates potential profit from total payout.
The core process is simple:
American Odds → Decimal Odds → Combined Decimal Odds → Payout and Profit
For positive American odds, the calculator uses the positive-odds conversion formula. For negative American odds, it uses the corresponding negative-odds formula. The resulting decimal odds are multiplied together to produce the combined parlay odds.
For example, if a parlay has combined decimal odds of 5.00 and the stake is $20, the estimated total payout is:
$20 × 5.00 = $100
The potential profit would be:
$100 − $20 = $80
The calculator also shows the implied probability, allowing you to consider potential return and mathematical probability together.
It is important to remember that a higher potential payout does not mean a higher probability of winning. Parlays require every leg to succeed, and adding additional selections can make the overall combination considerably more difficult to complete.
Use the DraftKings Parlay Calculator to understand odds, compare different combinations, estimate potential returns, and check your calculations before making decisions. Always verify the current odds and final payout information with the sportsbook, since actual results can vary due to odds changes, promotions, boosts, rounding, and other applicable rules.