Parlay Calculator

Multiply the decimal odds of every leg. Three legs at 2.0 give combined odds of 8.0, and a 10 stake returns 80.

Because the margin on each leg compounds. A 5% edge on each of four legs produces an edge well above 5% on the combined bet, which is why accumulators are the most profitable product on the book.

Almost always less than the fair value of the remaining position, because the margin is applied again at the point of cashing out. It buys certainty at a price.

A parlay needs every leg to win. A system bet covers multiple combinations of the legs, so partial success still returns something — at the cost of a larger total stake.

Yes, that is the defining feature. A void leg — a postponed match, say — is usually treated as odds of 1.0 and the rest of the bet stands.

Only where each individual leg has positive expected value, which is a demanding requirement. Combining several negative-expectation bets multiplies the disadvantage rather than diversifying it.

An accumulator on multiple outcomes within one match. The legs are correlated rather than independent, and bookmakers price them with an even larger margin to account for that.

Where one leg winning makes another more likely — a team winning and its striker scoring, say. Genuine correlation favours the bettor, which is why bookmakers restrict or reprice such combinations.

Combining place bets across multiple selections. It doubles the stake and returns something if the selections place rather than win, at considerably reduced odds.

Because even with a bonus the margin on a long accumulator exceeds that on a single bet. The bonus reduces an unusually large edge to a merely large one.

Almost never. Each leg adds its own margin, so the combined edge against you grows with the number of legs — while the payout grows in a way that feels like it should compensate and does not.

It is usually treated as odds of 1.0, so the accumulator continues with the remaining legs at reduced combined odds. Rules vary between bookmakers and are worth reading before it matters.