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A parlay pays every leg through the next one, so the prices multiply rather than add. Enter each leg below in American (−110) or decimal (1.91) odds and this page returns the combined price, the probability those prices imply, and what a stake would return. Nothing is sent anywhere — the arithmetic runs in your browser and no account is needed.
Two legs at -110 and -110. Each is 1.9091 in decimal odds, so the parlay is 3.64 decimal — +264 in American odds, an implied probability of 27.4%. A $10.00 stake returns $36.45, of which $26.45 is the win. Both legs have to land; one loss takes the ticket and the stake with it.
Decimal odds are the multiplier on your stake, stake included. A positive American price becomes odds ÷ 100 + 1, so +150 is 2.50. A negative price becomes 100 ÷ |odds| + 1, so −110 is 1.9091. Even money is 2.00 from either direction, which is why ±100 are the same price written twice.
The combined decimal price of the parlay is the product of every leg. Two −110 legs are 1.9091 × 1.9091 = 3.6446. This is the whole of the parlay maths — there is no bonus for adding legs and no separate parlay table; the multiplication is the payout.
If the combined decimal is 2.00 or higher the American price is (decimal − 1) × 100, so 3.6446 becomes +264. Below 2.00 it is −100 ÷ (decimal − 1), which is how a parlay of heavy favourites can still be priced as a favourite.
Implied probability is 1 ÷ the combined decimal — 27.4% for that two-leg ticket. It is the price expressed as a probability with the sportsbook’s margin still in it, not a forecast of whether the bet wins. Because each leg carries its own margin, the implied probability of a parlay falls faster than the true chance of it landing, and the gap widens with every leg you add.
The total returned on a winner is stake × combined decimal, and the net return is that minus the stake. $10 on the two-leg −110 parlay returns $36.45, of which $26.45 is the win. Every leg must land; one loss voids the ticket and the stake with it.
This is a straight multiplier, which is what a sportsbook uses for legs from different games. Same-game parlays are priced by the book itself, because legs from one game move together — a quarterback’s passing yards and his receiver’s catches are not independent. Expect a same-game ticket to be priced below what multiplying gives you, and treat the number here as the ceiling rather than the quote.
Convert every leg to decimal odds, multiply them together, then convert the product back. American to decimal is odds ÷ 100 + 1 for a positive price and 100 ÷ |odds| + 1 for a negative one. Two −110 legs are 1.9091 each, so the parlay is 1.9091 × 1.9091 = 3.6446 decimal, which is +264 in American odds. A $10 stake returns $36.45 on a winner.
Multiply your stake by the combined decimal odds — that is the total returned, stake included. $10 on a two-leg −110 parlay returns $36.45, of which $26.45 is the win. $10 on a three-leg −110 parlay returns $69.58. Add or remove a leg in the calculator above and the figure updates as you type.
It raises the payout and lowers the chance of collecting, and it compounds the sportsbook’s margin rather than diluting it. Each leg is priced with the book’s cut already in it, so multiplying five of them multiplies five margins together. That is why the implied probability the calculator shows falls away faster than most people expect. Longer parlays are not a strategy; they are a bigger price on a smaller chance.
No, and no straight multiplier is. A same-game parlay is priced by the sportsbook because its legs are correlated — they rise and fall together, so multiplying them as if they were independent overstates the price. Use this number as a ceiling for a same-game ticket and take the book’s own quote as the real one. For legs from different games the multiplication is exactly what the book does.
Odds and lines come from licensed data feeds and refresh on a schedule; hit rates, edges and grades are Parlay Builder’s own calculations.