For bettors

Parlay calculator

Add your selections, set a stake, and see the combined odds, payout and how likely the whole ticket is to land.

Selections

Stake

Result

Combined odds

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Total return

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Net profit—

Implied probability it all lands—

Selections—

Combined odds are the product of every leg. The implied probability assumes the legs are independent — correlated selections (same game, same team) do not multiply cleanly, and most books block or re-price them.

How a parlay is priced

A parlay (accumulator) is a single bet that needs every one of its legs to win. Its price is the product of the individual decimal odds: three legs at 1.80, 2.10 and 1.95 combine to 1.80 × 2.10 × 1.95 = 7.37. Your total return is stake × combined odds, and the whole stake is lost if a single leg fails.

The margin multiplies too

Each leg already carries the bookmaker's margin, and multiplying the prices multiplies the margin with them. A 5% edge per leg becomes roughly a 16% edge for the book over a four-leg parlay. That is why a long accumulator with a big advertised payout is one of the worst-value bets available — the expected loss per unit staked grows with every selection you add.

Independent vs correlated legs

The probability estimate — roughly 1 ÷ combined odds — only holds if the legs are independent. Selections from the same match (a team to win and over 2.5 goals, for example) are correlated, so they do not multiply cleanly. Bookmakers either block same-game combinations or price them with a dedicated same-game-parlay model rather than a straight multiplication.

Frequently asked questions

How are parlay odds calculated?

Multiply every leg's decimal odds together. Three legs at 1.80, 2.10 and 1.95 give combined odds of 1.80 × 2.10 × 1.95 = 7.37.

What is the probability my whole parlay lands?

Roughly 1 ÷ combined odds, assuming the legs are independent. Combined odds of 7.37 imply about a 13.6% chance the full ticket wins.

Why do bookmakers block same-game parlays or re-price them?

Legs in the same game are correlated, so they do not multiply cleanly. Books either forbid the combination or apply special same-game pricing.

Is a parlay ever better value than the same bets placed singly?

On pure expected value, almost never — the compounding margin sees to that. The case for a parlay is variance: a small stake for a large possible payout. If your goal is steady bankroll growth, singles are the better structure.

What is a "boosted" parlay and is the boost real value?

Bookmakers add a percentage bonus to accumulators of a certain size. Because the base price is already heavily margined, a 10–50% boost often just brings the parlay back toward fair value rather than past it. Compare the boosted price to the true multiplied odds to see.

How does a "each-way" or partial-win parlay pay?

This calculator prices a straight all-or-nothing parlay. System bets (Trixie, Yankee, Lucky 15) split the stake across every combination of the legs so a partial hit still returns something — they are a different structure and need a system-bet calculator.

Can I mix decimal, fractional and American odds across legs?

Convert every leg to decimal first — that is the only format that multiplies directly. The odds converter does each one, then enter the decimal values here.

Does the calculator send my selections anywhere?

No. It multiplies the odds and estimates the probability entirely in your browser. Nothing is logged or stored.

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