How are parlay odds calculated?

Multiply the decimal odds of every leg. Three legs at 1.80, 2.10 and 1.65 make 1.80 x 2.10 x 1.65 = 6.24, so a stake of 10 returns 62.37. American and fractional legs are converted to decimal first.

What happens when a leg is void?

A void or pushed leg is removed from the bet, which is the same as treating its odds as 1.00. The rest of the accumulator stands at the lower combined price. Set the leg to Void to see the new return.

Is an accumulator the same as a parlay?

Yes. Accumulator (or acca) is the usual name in the UK and Europe, parlay in the US. Both are one bet on several outcomes that all have to win.

Why is the implied chance so low?

Every leg has to win, so the chances multiply. Each leg also carries the bookmaker’s margin, and those margins compound, so the real chance of a long accumulator winning is usually lower than the implied figure.

Accumulator and parlay calculator

Add the legs of an accumulator or parlay to see the combined odds, the return on your stake and the chance the prices imply. Mark legs as won, void or lost as they settle. Free, no account, decimal, American and fractional odds.

Accumulator / parlay

Leg 1 odds
Result
Leg 2 odds
Result
Leg 3 odds
Result

Stake

Combined odds: 6.24
Return: 62.37
Profit: +52.37
Implied chance: 16.03%

Implied chance is read from the prices, margin included, for the legs still pending. Each leg’s margin compounds, so the true chance of winning is usually lower.

How it works

combined odds = odds 1 x odds 2 x ... x odds n

Return = stake x combined odds. Profit is the return minus the stake.
A void leg counts as 1.00, so it drops out of the price.
A lost leg loses the whole bet.
Implied chance = 1 / the combined odds of the legs still pending.

The combined price grows quickly, and so does the bookmaker’s share. Four legs from a book with a 5% margin on each carry roughly 20% of margin between them, which is why accumulators look generous and rarely are. Use the implied probability calculator or the no-vig calculator to see how much margin each leg carries.

Getting more from each leg

Because the odds multiply, a slightly better price on every leg makes a large difference to the return. Comparing each selection across bookmakers on the odds comparison before you combine them is the simplest improvement, and the free value bets page shows which prices sit above fair. With one leg left, the hedge calculator works out a hedge against the last leg. After the event, the CLV calculator and Pinnacle closing odds lookup show whether your prices beat the close.

More betting calculators

Calculators show arithmetic, not predictions. No result here guarantees a profit, and betting always carries the risk of losing your stake. Bet only what you can afford to lose; help and limits are on the responsible gambling page.

Frequently asked questions

How are parlay odds calculated?: Multiply the decimal odds of every leg. Three legs at 1.80, 2.10 and 1.65 make 1.80 x 2.10 x 1.65 = 6.24, so a stake of 10 returns 62.37. American and fractional legs are converted to decimal first.
What happens when a leg is void?: A void or pushed leg is removed from the bet, which is the same as treating its odds as 1.00. The rest of the accumulator stands at the lower combined price. Set the leg to Void to see the new return.
Is an accumulator the same as a parlay?: Yes. Accumulator (or acca) is the usual name in the UK and Europe, parlay in the US. Both are one bet on several outcomes that all have to win.
Why is the implied chance so low?: Every leg has to win, so the chances multiply. Each leg also carries the bookmaker’s margin, and those margins compound, so the real chance of a long accumulator winning is usually lower than the implied figure.