Parlay Calculator

A parlay is a single bet made of several selections that must all win for it to pay. Miss one leg and the whole ticket loses, however well the others did.

The appeal is the price. Because the legs multiply rather than add, three coin-flip bets that would each pay even money combine into a ticket paying roughly 7-to-1. The cost is that the bookmaker’s margin multiplies too — a three-leg parlay of standard −110 lines carries around 12.7% hold against 4.5% on a single bet — and the chance of hitting falls faster than the payout rises.

Also called an accumulator, an acca, or a multi, depending on where you bet.

Each leg has a checkbox beside it. Untick one and it drops straight out of the price while keeping its odds and its label, so you can ask “what does this ticket pay without the leg I am least sure about” and then put it back. Two active legs is the minimum — one leg on its own is a straight bet, and the calculator says so rather than quietly pricing it as a parlay.

A parlay pays only if every leg wins, so the legs multiply. Convert each price to decimal, multiply them together, and you have the combined decimal price of the ticket. Two −110 legs are 1.909 × 1.909 = 3.645, which is about +264 — not the +220 you would get by adding the two payouts, which is why parlays feel generous.

They feel generous because the probabilities multiply too, and that is the half nobody prices in their head. Each −110 leg implies 52.38%. Both landing implies 52.38% × 52.38% = 27.4%. Add a third leg and you are at 14.4%; a five-leg ticket of coin flips lands about one time in twenty-five. The payout grows fast, and the chance of collecting shrinks faster.

The other thing multiplying is the margin. Every leg carries the bookmaker’s hold, and stacking them compounds it — a two-leg parlay of −110s carries roughly double the vig of a single bet, a five-leg parlay roughly five times. That is the honest case against them: not that they never hit, but that the same money spread across single bets faces a smaller edge against it. The comparison line in the calculator shows what those singles would return.

One caveat: this assumes the legs are independent. Correlated legs — a team to win and its quarterback to throw three touchdowns — do not multiply cleanly, and sportsbooks price those as same-game parlays with an extra adjustment. Use this for legs from separate games.

Three legs at −110, +150 and −200. In decimal: 1.909, 2.50 and 1.50. Multiply: 1.909 × 2.50 × 1.50 = 7.159, or about +616.

A $100 stake returns $715.91, of which $615.91 is profit. The implied chance of all three landing is 1 / 7.159 = 13.97% — roughly one ticket in seven.

Split that $100 across the three legs instead, $33.33 each, and if all three win you collect about $97 in profit rather than $616. The parlay pays 6.4× more on the perfect outcome, and nothing at all on the seven other outcomes where at least one leg misses. That is the whole trade, in two numbers.

How are parlay odds calculated?

Convert every leg to decimal odds and multiply them together. The product is the parlay’s decimal price. American odds cannot be multiplied directly — a common error that produces wildly wrong payouts.

Are parlays a bad bet?

They carry more margin than the same legs bet singly, because each leg’s vig compounds. That makes them worse in expectation, not impossible to win. If you bet them, size them as the long shots they are rather than as a normal bet.

What happens if one leg pushes?

Most sportsbooks drop the pushed leg and recalculate the parlay with the remaining legs, so a three-leg parlay with one push pays as a two-leg parlay. Rules vary by book — check before assuming.

Does this work for same-game parlays?

No. Same-game legs are correlated, so their probabilities do not multiply, and sportsbooks apply their own adjustment to the combined price. Use this calculator for legs from independent games.

How many legs can I add?

Up to 15, which is at or beyond most sportsbooks’ limit. The implied chance of hitting a 15-leg ticket of −110 legs is roughly 1 in 30,000.

• Are Parlays Worth It? What the Math SaysParlays are not a scam and they are not free money. They multiply the margin as fast as they multiply the payout.10 min read

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