Parlay Calculator: See What Your Slip Pays, Pushes Included

How parlay odds multiply

American odds describe a bet of 100. A minus price is what you stake to win 100; a plus price is what 100 wins. To combine legs, each price is first turned into a decimal multiplier:

• Minus price: decimal = 1 + 100 ÷ odds. So -110 becomes 1 + 100/110 = 1.9091.
• Plus price: decimal = 1 + odds ÷ 100. So +150 becomes 2.50.

The payout is the stake times every decimal multiplier on the slip, which is all the parlay calculator does behind the scenes. To express the parlay as one American price, take the combined decimal, subtract one and multiply by 100: a combined 4.00 is +300.

The implied probability works the same way in reverse. Multiply the probabilities of the legs and you have the chance the price assumes for the whole parlay. That is the reason long parlays look generous: each extra leg multiplies the payout and divides the likelihood at the same time.

Worked example: -110, -110 and +150 for 100

Take two NFL sides at -110 and an underdog at +150, with a stake of 100.

• Leg one: 1.909091
• Leg two: 1.909091
• Leg three: 2.500000
• Combined: 1.909091 × 1.909091 × 2.5 = 9.111570

Payout: 100 × 9.111570 = 911.16. Profit: 811.16. As an American price the parlay is about +811.

All three legs have to win. Their implied probabilities, 52.38%, 52.38% and 40%, multiply to 10.98%, which is the break-even rate for this slip: a parlay like it has to land about one time in nine just to return the stakes.

The two -110 legs also show what the margin does. On a game where both sides are priced at -110, a fair price for each side would be +100, and two fair legs would pay 400 on 100. At -110 the same two legs pay 364.46. Each leg carries the sportsbook's margin, and the parlay multiplies those margins along with the odds.

What a push or a void leg does

A push happens when the result lands exactly on the line: a favourite at -3 that wins by three, or a total of 44 that finishes on 44. The stake on that leg is neither won nor lost. A postponed game, or a player prop where the player takes no part, is usually voided under the site's rules.

In a parlay that leg is treated as odds of 1.00, so it simply drops out and the parlay is settled on the legs left. Using the example above:

• The second -110 leg pushes. The slip becomes a two-leg parlay at -110 and +150: 100 × 1.909091 × 2.5 = 477.27.
• The +150 leg pushes. Two legs at -110 remain: 364.46.
• Two legs push. The parlay becomes a straight bet on the third: 190.91 if that is a -110 leg, 250.00 if it is the +150.

Set the leg to void in the parlay calculator and the figures follow. Half-point lines such as -3.5 or 44.5 cannot push, which is one way to keep a parlay at its full length. A few sites grade pushes differently in particular bet types, so their terms decide the final settlement.

Why same-game parlays are priced differently

A standard parlay multiplies the legs because the games are independent: one result tells you nothing about another. Inside a single game that is no longer true. A favourite covering a big spread and the game going over the total tend to happen together. A quarterback going over his passing yards and his top receiver going over his receiving yards are tied to the same throws.

If a sportsbook multiplied correlated legs, it would pay too much for combinations that are more likely together than apart. So it prices the same-game parlay as one joint outcome, which normally comes out shorter than the multiplied figure, and the margin on that combined price tends to be wider than on a single bet.

This is why the parlay calculator cannot price a same-game parlay: it multiplies, and multiplication assumes independence. Use the price the sportsbook shows for the whole same-game parlay, switch the bet type to singles and enter that price as one selection to see the return.

Parlays versus round robins

A round robin takes the same picks and splits them into smaller parlays. Three picks by twos make three two-leg parlays, so a single losing leg no longer loses the lot. The trade-off is a bigger total stake and a smaller return when everything wins. With the three legs from the worked example and 100 on each bet:

Per unit staked the parlay pays more when it wins; the round robin keeps something on the table when one leg fails. The round robin calculator builds every combination from four or more picks. Full-cover bets such as a Trixie or a Yankee, which add a parlay of all the legs to the smaller ones, are on the bet calculator.

What the parlay calculator does not include

• Correlation. Same-game parlays are priced by the sportsbook as one outcome; the multiplied figure overstates them.
• Boosts. Odds boosts and parlay boosts raise the payout above the plain product of the legs. They vary by site and are not in the figures.
• Payout limits. Every site caps the maximum payout on a single bet, and a long parlay at plus prices can reach that cap.

Big parlay wins: the withdrawal ceiling and the identity trigger

Parlays are the bets most likely to turn a small stake into a large balance. Six legs at -110 turn 100 into 4,841.27. On sites that take bets without asking for documents at sign-up, two figures in the terms decide how that money comes out.

The first is the withdrawal ceiling, set per day, per week or per month. A win above it is paid out in parts across several periods. The second is the identity trigger, the withdrawal amount or the account activity at which the site can ask for documents before it pays. A win above that level is paid once the check is complete. Both sit in the site's terms, and both are worth reading before a long parlay is placed rather than after it lands. The fast withdrawal betting sites page compares how quickly sites pay.

Parlays on NFL and NBA lines

Most parlay legs in American sports are spreads and totals at or near -110, which is why the parlay calculator opens with American odds. In the NFL, many games are decided by three or seven points, so whole-number spreads on those figures push more often than others; the NFL betting guide covers how those lines are set. NBA spreads and totals move in larger numbers and are often posted at half points, as explained on the basketball betting page. Whatever the sport, a parlay is a long shot by design, and the stake should be one you can afford to lose; the responsible gambling page sets out the tools sites provide.

Before you deposit, check how the no verification sportsbooks we cover handle large withdrawals.

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