Parlay Calculator: Combined Odds, Payouts & Hidden Vig

A parlay calculator turns several bet legs into one combined price and shows what a winning ticket pays. It converts every leg to decimal odds, multiplies them together, and multiplies your stake by the result.

Two −110 legs and a +150 leg on a $20 stake return $182.23, and the tool below prices any parlay for you. Enter your legs, then read on for the formula and the one number sportsbooks would rather you not calculate.

Try It: Parlay Calculator

Add or remove legs, type each price in American or decimal, and set your stake.

The tool multiplies the legs into combined odds and a payout, then shows the break even win chance the price bakes in. Drag the slider to your own estimate of how often the whole parlay hits to see whether it is a positive expected value bet.

The verdict starts on "No edge" for a reason: at the sportsbook's own price, a parlay is a break even bet before the vig, which means a losing one after it. It only turns positive if your estimated chance beats the price. More on that below.

How a Parlay Calculator Works

A parlay pays off only if every leg wins, so its odds are the product of the legs, not the sum. The math runs in decimal odds because decimals multiply cleanly:

1. Convert each leg to decimal. A betting odds converter or the odds converter tool does this instantly: −110 becomes 1.91, +150 becomes 2.50.
2. Multiply the decimals together. That product is your combined parlay odds.
3. Multiply the combined odds by your stake. That is the total return, stake included.

Worked through the default parlay, an illustrative example: −110 is exactly 1.909 in decimal, so 1.909 × 1.909 × 2.50 = 9.11 combined decimal odds. A $20 stake returns $182.23 total, so $162.23 of profit. Convert 9.11 back to American and it reads +811.

The break even chance is 1 ÷ 9.11, or 10.98%. That is the share of the time the whole ticket has to hit just to break even at this price.

The pattern is why parlays feel exciting. Each leg you add multiplies the payout, so the numbers climb fast. What climbs just as fast, and stays hidden, is the sportsbook's cut.

Parlay Payout Reference

Here is what a $100 parlay of standard −110 legs pays as you stack more legs. The last column is what the same parlay would pay if every leg were a true coin flip priced at fair odds with no vig, which is +100.

The gap between the two payout columns is money the sportsbook keeps. It is small on a two-leg ticket and large on a six-leg one, and that widening gap is the whole story of parlay math.

Why Parlays Multiply the Vig Against You

Every line a sportsbook posts carries a margin called the vig, or hold. On a standard −110 market the book holds about 4.5%. The two sides add up to roughly 105% implied probability instead of 100%, and that extra 5% is the house edge on a single bet.

A parlay does not just carry that edge once. It multiplies it.

When you combine legs, you multiply their prices, and you multiply the built in margins along with them. The implied probability of the combined price drifts further above the true probability with every leg you add.

Run the numbers on −110 legs. One leg holds about 4.5%. Stack six of them and the parlay holds close to 24% of a fair payout, as the reference table shows. That multiplied margin is a big part of how sportsbooks make money and why every app pushes parlays so hard.

One of the most valuable habits in betting, shopping for the best line on each leg, matters more here than almost anywhere, because the leak compounds.

When a Parlay Leg Pushes

A push is a tie against the line, and inside a parlay it does not lose the ticket. The book drops the pushed leg and reprices the parlay on the legs that are left.

The table above shows what that costs. A 4 leg parlay of −110 legs pays +1228, or $1,328 on $100. If one leg pushes, it settles as a 3 leg parlay at +596, or $696.

The ticket survives, but the payout roughly halves. The full settlement rules are in what a push does to a parlay.

When a Parlay Is Actually a Good Bet

There is one honest case for a parlay, and the parlay calculator's slider points straight at it. A parlay of legs that are each a positive expected value bet stays positive expected value when you combine them, because you are multiplying edges, not just prices.

The requirement is strict. Every single leg has to be a bet you would happily place on its own, at a price that beats its true probability. If even one leg is a coin flip you talked yourself into, it drags the whole ticket underwater, and the compounding vig finishes the job.

That is what the slider models. Set your honest estimate of how often the whole parlay wins, and the tool compares it to the break even chance in the price. It uses the same math as the expected value calculator and the expected value tool.

If your estimate does not clear the price, the parlay is a negative bet no matter how big the payout looks.

SmartStake's Positive EV tool builds this kind of ticket from real prices. Its parlay slip builder (Premium) combines +EV legs at a single sportsbook and multiplies their prices and their fair probabilities.

The slip then shows its combined EV and a suggested stake from your Kelly settings. A taken slip goes into the Bet Tracker as one parlay. A strong combined EV is still a long run average, and any single parlay can win or lose.

Two places parlays are genuinely worth a look:

• Clearing a promo. A free bet has no stake to lose, so its math favors a longer shot. A parlay is one clean way to swing for the larger payout a free bet rewards.
• Pick'em contests. A DFS pick'em slip is a parlay in a different wrapper, and the same combined odds math tells you whether the entry is priced in your favor.

A teaser is a parlay too, with every line moved in your favor and the payout cut to pay for it. The teaser betting guide works out the win rate each leg needs.

Same Game Parlays and Correlation

The multiply the odds rule assumes the legs are independent, meaning one leg winning tells you nothing about another.

A same game parlay breaks that assumption. If you parlay a quarterback to throw for over 250 yards and his team to win, those outcomes move together, so the true combined probability is higher than a naive multiplication suggests.

Sportsbooks know this. Same game parlays are priced by a custom correlation model, not by multiplying the legs, and that model is where they build in extra margin.

A plain parlay calculator gives you the independent baseline, which is exactly why it is useful.

It shows you what the legs should be worth before the book adjusts, so you can see how much correlation the price is charging you for. The same game parlay strategy guide solves for the correlation a given price demands.

SmartStake watches for the same link across your separate bets. A correlation warning appears beside a bet in the Positive EV feed, and in bet details in Positive EV and the Odds Screen, when it is linked to a bet you already hold.

The Bottom Line

A parlay calculator answers the question you came with, what does this ticket pay, and it multiplies decimal odds to get there. Keep the smaller question in view too. The payout grows with every leg, but so does the vig baked into the price, and only genuinely good legs can outrun it.

Size these tickets as the long shots they are, and lean on bankroll discipline so a cold streak of parlays costs no more than you planned for. If you are down to the last leg of a live ticket, the hedge bet calculator shows what locking in a result costs.