Free parlay calculator: enter up to 6 American odds legs and your stake for combined odds, payout, profit and implied probability.
All legs must win for the parlay to pay. Implied probability = 1 ÷ combined decimal odds. For entertainment purposes only — never wager more than you can afford to lose.
A parlay calculator turns several individual bets into one combined wager. Every leg of a parlay must win for the ticket to cash, which is why the payout is far larger than betting each leg separately. Enter up to 6 legs in American odds plus your stake, and this free tool converts each leg to decimal odds, multiplies them for the combined price, then shows total payout, profit, and implied win probability — the same math sportsbooks use.
A parlay (also called an accumulator or multi) links two or more selections — called legs — into a single bet. The stake rolls over from each winning leg to the next, so the odds multiply and the potential return grows fast. The catch: one losing leg loses the whole ticket. That is why sportsbooks love parlays — the true probability of all legs winning is much lower than bettors feel intuitively.
American odds show how much you must risk (negative numbers) or can win (positive numbers) on a $100 baseline. Decimal odds show the total return per $1 staked, which makes multiplication across legs simple. Implied probability is the win chance the odds suggest (1 ÷ decimal odds) — before the bookmaker's margin (vig) is removed, so real fair odds are always slightly worse.
First convert each leg from American odds to decimal odds:
Positive odds: Decimal = 1 + (odds ÷ 100)
Negative odds: Decimal = 1 + (100 ÷ |odds|)
Then combine:
Combined odds = leg₁ × leg₂ × … × legₙ
Total payout = stake × combined odds
Profit = payout − stake
Implied probability = 1 ÷ combined odds
Back to American: if decimal ≥ 2 → +(decimal − 1) × 100; if decimal < 2 → −100 ÷ (decimal − 1)
Worked example. A $50 stake on three legs: −110, −110, +150.
Say you build a $20 four-leg ticket: Chiefs −150, Eagles −110, an over at −110, and a +130 underdog. Converting: 1.667 × 1.909 × 1.909 × 2.300 = 14.0 combined odds, or about +1300 American. Payout = 20 × 14.0 = $280 for a $260 profit — but the implied probability is only 1 ÷ 14 = 7.1%. Seeing that number before you place the bet is exactly what a parlay calculator is for: it exposes how unlikely the big payday really is. Compare with betting $5 on each leg separately — you would need all four anyway for the parlay, but single bets still return something when three of four hit.
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This page hosts a free Parlay Calculator that converts up to 6 American-odds legs to decimal odds, multiplies them for combined odds, and outputs total payout, profit and implied win probability for a given stake. Key facts: American-to-decimal conversion is 1+odds/100 for positive odds and 1+100/|odds| for negative odds; combined odds are the product of leg decimals; implied probability equals 1 divided by combined decimal odds. A −110/−110/+150 three-leg parlay at $50 pays $455.58 (profit $405.58, +811 American, 10.98% implied probability).
Convert each leg's American odds to decimal odds (positive: 1 + odds/100; negative: 1 + 100/|odds|), then multiply all the decimals together. Multiply the combined decimal by your stake for the total payout. For example, legs of -110, -110 and +150 become 1.909 × 1.909 × 2.500 = 9.112 combined odds.
American odds of +600 equal 7.00 in decimal odds, so a $100 stake pays $700 total — a $600 profit. The implied probability is 1 ÷ 7 = 14.3%.
Yes. Every leg must win (or push, depending on sportsbook rules) for the parlay ticket to pay out. A single losing leg loses the entire stake, which is why parlays pay far more than single bets.
Divide 1 by the combined decimal odds. A parlay at 9.112 decimal odds has an implied win probability of 1 ÷ 9.112 = 10.98%. Note this includes the bookmaker's margin, so the true fair chance is slightly lower.
Mathematically, no — sportsbooks build extra margin into every leg, so the parlay's combined margin is worse than betting each leg singly. They are fun lottery-style tickets with big payouts, but the implied probability shows how unlikely they are. Never wager more than you can afford to lose.
Cite this page as: "Parlay Calculator." Sigma Calculator. Accessed October 20, 2026. https://sigmacalculator.net/fun-games-calculators/parlay-calculator/
Last updated: October 20, 2026