Parlay calculator.
Add every leg of your parlay, set your stake, and this free parlay calculator multiplies the odds to give you the combined price, your total payout and profit, and the real probability the whole ticket lands. It takes American, decimal or fractional odds. UK bettors call the same bet an accumulator or acca. The guide below shows the math, and the one thing most parlay tools hide: how the bookmaker edge grows with every leg you add.
Build your parlay
LiveTo win (profit)
59.58
total payout 69.58
Every leg must win for the parlay to pay. Probability shown is the combined implied probability, which includes the bookmaker margin. Calculations run in your browser; nothing is stored. For entertainment, not betting advice.
The short answer
What is a parlay?
A parlay is a single bet that links several picks together, where every pick must win for the bet to pay. The odds of each leg multiply, so the potential payout climbs fast, but so does the risk: one losing leg and the whole bet is gone. UK and Irish bettors call the exact same bet an accumulator, or acca for short.
How to use this calculator
Pick your odds format, type the odds for each leg, and add your stake. Use Add selection to include more legs, up to twelve, and Remove to drop the last one. The calculator multiplies the legs into one combined price and shows your profit, total payout, and the probability the full ticket lands.
Three legs at -110 turns a 10 stake into a 69.58 payout, a 59.58 profit, at combined odds of +596. The same three legs imply a 14.37% chance of cashing, so it is a long shot dressed up as a small stake for a big return.
The math
How parlay odds are calculated.
It is just multiplication. Convert each leg to decimal odds, multiply them all together, and that is your combined price. Multiply by your stake for the payout.
Turn each leg into decimal odds. A positive American price divided by 100 plus 1; a negative price is 100 divided by its size plus 1. So -110 becomes 1.909.
Multiply the decimal odds of every leg together. Three legs at 1.909 give 1.909 times 1.909 times 1.909, which is 6.96.
Multiply that combined figure by your stake for the total payout, then subtract the stake for your profit. A 10 stake returns 69.58, a profit of 59.58.
For the chance of winning, divide 1 by the combined decimal odds. 1 divided by 6.96 is 14.37%, the implied probability the whole parlay lands.
By the legs
Parlay payout by number of legs.
Each row adds one more leg at -110, the standard spread price. Watch the combined odds and payout explode, and the win chance shrink, with every pick.
| Legs at -110 | Combined odds | Payout on 100 | Win chance |
|---|---|---|---|
| 2 | +264 | 364.46 | 27.44% |
| 3 | +596 | 695.79 | 14.37% |
| 4 | +1228 | 1,328.33 | 7.53% |
| 5 | +2436 | 2,535.91 | 3.94% |
| 6 | +4741 | 4,841.27 | 2.07% |
The part nobody shows you
Why parlays favour the house.
A single bet at -110 carries a 4.55% house edge. The catch with a parlay is that the edge is taken on every leg, so it compounds. Each pick you add hands the book a bigger slice.
| Legs (at -110) | House edge |
|---|---|
| 1 | 4.55% |
| 2 | 8.88% |
| 3 | 13.03% |
| 4 | 16.98% |
| 5 | 20.75% |
| 6 | 24.36% |
By six legs the book is keeping roughly a quarter of the true value of your bet. This is why parlays are the most profitable product a sportsbook offers, and the hardest bet for you to beat over time.
The long shot
The chance every leg wins.
Even with coin-flip picks that each win half the time, the odds of hitting all of them fall off a cliff. Here is the chance a parlay lands if every leg is a genuine 50/50.
| Legs (50/50 each) | Chance all win |
|---|---|
| 2 | 25% |
| 3 | 12.5% |
| 5 | 3.13% |
| 8 | 0.39% |
| 10 | 0.10% |
A 10-leg parlay of coin flips lands roughly once in a thousand tries. The huge payout is real, but so is the reason it is huge: it almost never happens.
Same bet, different name
Parlay, accumulator or acca?
All three are the exact same bet: several picks combined, all must win. The name just depends on where you are.
Parlay (United States)
The standard US and Canadian term. A 2-leg parlay, 3-leg parlay and so on, usually priced in American odds.
Accumulator and acca (UK and Ireland)
British and Irish bettors say accumulator, or acca for short. A four-fold or five-fold just means a 4 or 5 leg acca, usually in decimal or fractional odds.
The math is identical
Whatever the name, the calculation is the same: multiply the odds of every leg, then by your stake. This calculator handles all three odds formats, so it works wherever you bet.
Before you bet
An honest word on parlays.
Parlays are fun and the payouts look spectacular, but the math is plain: the more legs you add, the bigger the bookmaker edge and the smaller your chance of winning. Over time, parlay bettors lose faster than single-bet bettors, because the margin is charged on every leg at once.
This calculator is here to show you exactly what a ticket pays and how likely it is, so you can see a long shot for what it is before you place it. It will not make you a winner; nothing can guarantee that. Bet only what you can afford to lose, and if it stops being fun, free confidential help is at BeGambleAware.org.
Questions
Parlay questions.
What is a parlay bet?
+
A parlay is a single bet that combines two or more picks, where every pick must win for the bet to pay. The odds of each leg multiply together, so the payout is much bigger than a single bet, but one losing leg loses the whole parlay. UK bettors call it an accumulator or acca.
How is a parlay payout calculated?
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Convert each leg to decimal odds, multiply them all together, then multiply by your stake. Three legs at -110 are 1.909 each, which multiply to 6.96, so a 10 stake returns 69.58. Subtract the stake for your profit of 59.58.
How many legs have to win?
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All of them. A parlay only pays if every single leg wins. If even one leg loses, the entire bet loses. That all-or-nothing rule is why the payouts are large and why parlays are hard to land.
Are parlays a good bet?
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For value, no. The bookmaker margin is taken on every leg, so it compounds: a single bet at -110 carries a 4.55% edge, but a 6-leg parlay carries about 24%. They are fun for a small stake, but the more legs you add, the worse the value gets.
What is the difference between a parlay, an accumulator and an acca?
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None, they are the same bet. Parlay is the US and Canadian term; accumulator is the UK and Irish term; acca is just short for accumulator. The way the odds and payout are worked out is identical, which is why this calculator covers all three.
How many legs can a parlay have?
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Most sportsbooks allow anywhere from 2 to 12 or more legs, though limits vary. This calculator handles up to 12. Remember that each extra leg multiplies the odds but sharply cuts your chance of winning, so bigger is not better for your returns.
Do all the legs need different games?
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Traditionally yes, legs had to be from separate games so the outcomes were independent. Many books now offer same-game parlays, where the legs are correlated and priced differently. This calculator works for any parlay once you enter each leg’s final odds.
About the developer
Jean Borg
Jean builds and maintains every calculator on freecalculators.pro from Malta, with a focus on tools that are fast, free and show their working. This parlay calculator uses standard odds multiplication and the figures are verified for accuracy. It is provided for education and entertainment, not as betting advice. Please bet responsibly. Page last updated June 2026.