15 Game Parlay Calculator

A 15-game parlay is a multi-game wager where you bet on multiple outcomes to win a larger prize. This calculator helps you determine your chances of winning and the potential payout.

What is a parlay?

A parlay is a type of sports bet where you combine multiple individual bets into a single wager. For a parlay to win, all of the individual bets in the parlay must win. If any single bet loses, the entire parlay loses.

Parlays are popular because they offer higher potential payouts compared to single-game bets. However, the odds of winning a parlay decrease significantly with each additional game added to the bet.

Parlays are also known as accumulator bets or combination bets in different regions.

How to calculate a 15-game parlay

Calculating the odds of winning a 15-game parlay involves multiplying the probability of each individual game winning together. The formula is:

Parlay Odds = (Probability of Game 1) × (Probability of Game 2) × ... × (Probability of Game 15)

For example, if each game has a 50% chance of winning (American odds of +100), the combined odds would be:

0.5 × 0.5 × ... × 0.5 (15 times) = 0.0000305 (or 0.00305%)

This means you have a 0.00305% chance of winning the parlay if each game is an even-money bet.

Payout calculation

The payout for a parlay is calculated by multiplying the stakes of each individual bet together and then multiplying by the parlay odds. The formula is:

Parlay Payout = (Stake 1) × (Stake 2) × ... × (Stake 15) × (Parlay Odds)

For example, if you bet $1 on each of 15 games with American odds of +100, your potential payout would be:

$1 × $1 × ... × $1 × 0.0000305 = $0.000305

This means you would win just $0.000305 for a $15 total wager, which is not practical.

Example calculation

Let's look at a practical example with real odds:

Game	Bet Type	American Odds	Decimal Odds	Probability
Game 1	Team A to win	+200	3.00	33.33%
Game 2	Team B to win	+150	2.50	40.00%
Game 3	Team C to win	+125	2.25	44.44%
...	...	...	...	...
Game 15	Team O to win	+180	2.80	35.71%

Calculating the combined probability:

0.3333 × 0.4000 × 0.4444 × ... × 0.3571 ≈ 0.00000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000