The parlay calculator multiplies the odds of every leg in a parlay, or accumulator (acca) as it is called in the UK and Ireland, and shows the combined price, the implied chance of the whole bet landing and what your stake returns. Add up to 20 selections in fractional, decimal or American odds and the results update as you type.
Parlay calculator
This calculator works on the standard version of the page.
Open the calculatorHow to use the parlay calculator
The calculator opens with three sample legs at 1.80, 2.10 and 1.65 and a stake of 10, which gives combined odds of 6.237 and a return of 62.37. Replace them with your own selections:
- Type the price of each leg in the format your sportsbook shows: 4/5, evens, 1.80, -110 or +150. Formats can be mixed on the same slip.
- Press Add selection for each extra leg, up to 20, and Remove last to drop the bottom one.
- Enter the total stake for the whole bet as a plain number. There is no currency symbol.
- Read the combined odds in decimal, the American equivalent, the implied probability, the total return and the profit.
A double is a two-leg acca, a treble has three legs, a four-fold four, and so on. The total return includes your stake.
The parlay formula
A parlay pays as if the full return from each winning leg is staked on the next one. In practice that means converting every leg to decimal odds and multiplying them together. The combined odds are leg 1 x leg 2 x leg 3, and so on for every selection. The total return is the stake x the combined odds, the profit is the total return minus the stake, and the implied probability is 1 divided by the combined odds.
That implied probability is the price's view of the chance that every leg wins. It already contains the bookmaker's margin on each leg, multiplied together, which is why a long acca carries a far bigger built-in edge for the bookmaker than a single bet.
Fractional and American legs are converted first, as in the odds calculator: 4/5 is 1.80, +150 is 2.50 and -110 is 1.909.
Worked examples: a UK acca and a US parlay
A £10 four-fold acca on Saturday football (soccer) at evens, 4/5, 1/2 and 6/4. In decimal those are 2.00, 1.80, 1.50 and 2.50. Multiply them in order: 2.00 x 1.80 = 3.60, then x 1.50 = 5.40, then x 2.50 = 13.50. The £10 returns £135, a profit of £125. As an American price that is +1250, and the implied probability is 1 / 13.50 = 7.41%, so the price expects this acca to land roughly once in every 13 or 14 attempts.
A $20 three-team parlay in the US: two point spreads at -110 and a moneyline at +150. The decimals are 1.909, 1.909 and 2.50. Multiplied with the unrounded spread prices, the combined odds are 9.112, or +811 in American terms. The $20 returns $182.23, a profit of $162.23, and the implied probability is 10.98%.
The two -110 spreads are each priced close to a coin flip, yet together with the moneyline they take the chance of being paid down to about one in nine. That is the trade every parlay makes: a bigger payout in exchange for a much lower chance of collecting it.
Void legs, pushes and what the calculator does not cover
The calculator assumes every leg wins at the price entered. Settlement often throws up other cases:
- Void legs and pushes. If a match is postponed, a player does not start, or a spread lands exactly on the number, most sportsbooks settle that leg at odds of 1.00 and carry on with the rest. To model it, remove the leg. In the acca above, a void on the 1/2 leg leaves 2.00 x 1.80 x 2.50 = 9.00, so the £10 returns £90. In the US parlay, a push on one -110 spread leaves a two-team parlay at 4.773, and the $20 returns $95.45.
- Dead heats. A leg that ties, common in golf and racing place markets, is usually settled at reduced odds, which cuts the whole payout.
- Rule 4. A horse racing leg can carry a deduction if another runner is withdrawn late.
- Each-way accas. These are two bets, a win acca and a place acca. Enter the win prices for one part, then the place odds of each leg for the other, or use the each way calculator for a single.
- Same game parlays and bet builders. Legs from one match are often linked, so the sportsbook prices them together and the quoted price is usually lower than the straight multiplication. Use the price on your slip.
- Maximum payouts. Every sportsbook limits how much a single bet can pay, and long accas with big stakes are where that limit bites. The figure varies by operator, so check it first.
Rules on postponements, retirements and pushes differ between books, so read them before you build the slip.
Related guides and a check before you place the acca
For the full picture of how accas settle and how system bets such as a Trixie or Yankee work, read parlays and accumulators explained. Prop bets and bet builders covers same game parlays and why correlated legs are priced differently. The implied probability guide shows how to take the bookmaker's margin out of a single price.
Before you place the acca, put your own numbers next to the calculator's. Multiply your estimated chance for each leg and compare the result with the implied probability. Four legs you rate at 60% each give 0.60 x 0.60 x 0.60 x 0.60 = 12.96%. A four-fold priced at 6.00 implies 16.7%, so on your own numbers that bet is worse than it looks.
Keep acca stakes small against your bankroll (see bankroll management), check that betting is legal where you live and use a licensed sportsbook. If chasing one big acca win is turning into a habit, the responsible gambling page lists tools and support.
Frequently asked questions
How is a parlay payout calculated?
Convert each leg to decimal odds, multiply them together, then multiply by the stake. Three legs at 1.80, 2.10 and 1.65 give combined odds of 6.237, so a $10 parlay returns $62.37, a profit of $52.37.
Is a parlay the same as an accumulator?
Yes. Parlay is the US term, and accumulator or acca is used in the UK, Ireland and most other markets. A double, treble or four-fold is simply an acca with two, three or four legs.
What happens to my parlay if one leg is void or pushes?
At most sportsbooks that leg is settled at 1.00 and the bet continues with the remaining legs, so the payout falls. Remove the leg in the calculator to see the new return.
Can I mix fractional, decimal and American odds?
Yes. Each leg is converted to decimal odds before the multiplication, so a slip with 4/5, 2.10 and +150 works out exactly the same as one entered as 1.80, 2.10 and 2.50.
Why is my bet builder price lower than the calculator's result?
Legs from the same match tend to move together: a team winning and its striker scoring often happen in the same game. The sportsbook adjusts the price for that link, so it is usually lower than the straight multiplication. The calculator is accurate for legs from separate events.