Parlay calculator: combine odds and read the payout
A parlay, also called an accumulator, combines several selections into one bet. This calculator multiplies their decimal odds, applies your stake and separates the total return from net profit. You can also update each selection’s result to see what a win, loss or void does to the bet.
How to calculate parlay odds
Enter between 2 and 20 selections using decimal, fractional or American odds. The calculator converts each price to its decimal equivalent before multiplying. For example, 1/2 and −200 both equal 1.50. Switching the display format keeps the original prices; editing a price replaces it.
A three-leg parlay payout example
For odds of 1.80, 2.10 and 1.50, the combined decimal price is 1.80 × 2.10 × 1.50 = 5.67. With a stake of 20 units, all three selections winning would return 20 × 5.67 = 113.40 units. Subtract the original stake to get 93.40 units of net profit.
Total return includes your stake. A larger combined price does not make the result more likely: every non-void selection must win for a standard parlay to pay.
Won, lost, pending and void selections
A pending selection keeps the calculation conditional: the displayed potential return assumes every remaining selection wins. Marking one selection as lost makes the return zero and the net result equal to minus the stake. Selections marked won keep their accepted odds in the calculation.
A void selection contributes a factor of 1. In the example above, voiding the 1.50 selection leaves 1.80 × 2.10 = 3.78, so a 20-unit stake could return 75.60. If every selection is void, the calculator returns the stake with no profit. Check the operator’s rules for the event and market.
What the implied probability tells you
Divide 100 by the combined decimal odds to get the price’s implied percentage. Odds of 5.67 imply about 17.64%. This is not a measured chance that your selections will win, and it is not the updated chance of the remaining selections after some have won. Bookmaker margins and relationships between outcomes are not removed.
Rounding and input limits
Enter a stake from 0 to 1,000,000 units with at most two decimal places. A dot or comma can be the decimal separator; leave out thousands separators. Non-void selections accept prices equivalent to decimal odds from 1.000001 to 10,000.
Returns are rounded once, at the final amount, to 0.01 unit; an exact half-cent rounds up. Shortened odds displays do not replace the underlying entered prices. The calculator rejects combined odds or a calculated return above 1,000,000,000,000.
Standard accumulators and same-game parlays
This is a standard accumulator calculator, not a same-game parlay pricing engine. Related selections may need a bookmaker’s combined quote rather than simple multiplication. The tool also excludes system bets, each-way bets, half-win or half-loss settlements, free-bet stake rules, odds boosts, commission and taxes. Use the accepted bet slip and its rules for an actual settlement.
Why the sportsbook margin compounds on a parlay
Each leg’s price already includes a margin. On a parlay, those prices are multiplied, so the margin compounds. The figures below are an illustration, not a quote from a specific book.
Take three independent even-money legs, each paying decimal 1.92. A fair even-money price is 2.00. At a true 50% chance of winning each leg, the expected value of one $1 bet at 1.92 is 0.5 × 0.92 + 0.5 × (−1) = −0.04, a 4% house edge. The parlay’s decimal payout is 1.92 × 1.92 × 1.92 = 7.077888. The chance that all three legs win is 0.5³ = 0.125. Expected value is 0.125 × (7.077888 − 1) + 0.875 × (−1) = −0.115264, or a 11.53% house edge. That is the same as 1 − 0.96³ = 0.115264.
The calculator shows the combined price and payout from the odds you enter. It does not remove the margin. For a single-leg conversion or implied probability, use the Odds Converter.