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Parlay Calculator: Combined Odds & Payout
Enter decimal odds for 2–10 selections and a stake. See combined odds, gross return, profit and implied chance. Probability multiplication assumes independent results.
How it works & examplesUnderstand the calculation
Parlay odds multiply; so does the need for every leg to win
For a standard all-win accumulator, multiply the decimal odds of its legs. Prices of 1.50 and 2.00 produce combined odds of 3.00. A 10-unit stake then returns 30 gross if both win, giving 20 profit. One losing leg makes the accumulator lose under the simple settlement model used here.
Selections from the same game are not always statistically independent; examine that dependence in 2-Leg SGP Correlation & Fair Odds Calculator.
Combined odds describe payout, not a trustworthy chance of success. Multiplying independently estimated probabilities only gives a valid joint probability when the independence assumption is appropriate. Related selections can violate that assumption. The calculator does not price same-game correlations or model every operator's void, dead-heat or promotional rule.
Maths & verification
Multiply 2–10 decimal odds, calculate parlay payout, implied probability and hypothetical expected value using independent-leg assumptions.
Try the simulator below. Input values stay in your browser; no account or money is involved.
Model assumptions: No. Virtual games use declared teaching models. Verify any actual operator’s payout rules independently.
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How to use the tool
Calculate an accumulator's combined decimal odds without confusing quoted implied probability with the true chance of winning.
- Enter decimal odds above 1 for 2 to 10 legs.
- Enter a stake in any consistent currency or credit unit.
- Review combined odds, gross return, net profit and implied probability.
Understanding your result
With decimal odds 2.00 and 1.50, combined odds are 3.00. A 10-unit stake has a 30-unit gross payout and 20-unit net profit if every leg wins.
Scope and limitations
Multiplying prices is standard for a simple accumulator, but multiplying probabilities is only valid for independent outcomes. Correlated same-game parlays, void legs, stake limits, margin and settlement rules require bookmaker-specific treatment.
Before you rely on the result
- How the calculation works
Formulas, assumptions, rounding and model limits are documented on the methodology page.
- Check the current inputs
Use the odds, RTP, fees, bonus terms or other values currently shown by the operator or market.
Parlay calculator: combined odds, implied probability and payout
For decimal odds, a parlay's combined price is the product of every leg: combined odds = d1 × d2 × ... × dn. Gross return = stake × combined odds.
The reciprocal of combined odds is the market-implied break-even probability of the parlay price. Interpreting it as the true joint probability requires much stronger assumptions.
How each leg changes the combined price
Two legs at 2.00 and 1.50 combine to 3.00. A third leg at 1.80 lifts the combined odds to 5.40.
| Legs | Combined decimal odds | Implied break-even probability |
|---|---|---|
| 2.00 × 1.50 | 3.00 | 33.33% |
| 2.00 × 1.50 × 1.80 | 5.40 | 18.52% |
| 1.80 × 1.80 × 1.80 | 5.832 | 17.15% |
Multiplying probabilities assumes independence
If you provide separate true-probability estimates, multiplying them is appropriate only when the legs are independent. Same-game events can be strongly correlated, so the true joint probability can differ substantially from the simple product.
Bookmaker margin compounds too
A parlay multiplies the offered prices, including any margin already embedded in each leg. More legs can therefore increase the gap between a headline payout and fair combined odds even when the arithmetic payout calculation itself is correct.
Questions about this calculation
Is implied probability my real chance to win?
No. It is the reciprocal of quoted combined decimal odds, which may incorporate bookmaker margin and is not a validated forecast.
Can I use same-game selections?
This simple calculator does not model correlations or same-game parlay pricing. Use quoted bookmaker prices and rules for correlated legs.
When is Parlay Calculator: Combined Odds & Payout the right tool?
Calculate an accumulator's combined decimal odds without confusing quoted implied probability with the true chance of winning.
How should I read the result from Parlay Calculator: Combined Odds & Payout?
With decimal odds 2.00 and 1.50, combined odds are 3.00. A 10-unit stake has a 30-unit gross payout and 20-unit net profit if every leg wins.
What can Parlay Calculator: Combined Odds & Payout not tell me?
Multiplying prices is standard for a simple accumulator, but multiplying probabilities is only valid for independent outcomes. Correlated same-game parlays, void legs, stake limits, margin and settlement rules require bookmaker-specific treatment.