How to Calculate Parlay Odds (Step by Step, With Examples)

To calculate parlay odds, convert every leg to decimal odds, multiply the decimals together, then convert the result back to the format you prefer. That is the whole method. What most bettors never see is what that multiplication does to the sportsbook's built-in margin, and that is what decides whether a long parlay is worth building.

This guide gives you the steps, a fully worked three-leg example, a payout chart for two to six legs, and a plain explanation of why every extra leg costs more than it looks. It also shows how Parlitify puts the combined price in front of you before you place anything.

The short answer: parlay odds in three steps

1. Convert each leg to decimal odds. Decimal odds are the total return per $1 staked, stake included. They are the easiest format to multiply.
2. Multiply the decimals. The product is the decimal price of the whole parlay.
3. Convert back if you want. Stake × the parlay decimal is your total return. Subtract the stake to get the profit.

Converting American odds to decimal

• Positive odds (+150): decimal = 1 + (odds ÷ 100). So +150 becomes 1 + 1.50 = 2.50.
• Negative odds (-200): decimal = 1 + (100 ÷ the odds without the minus sign). So -200 becomes 1 + 0.50 = 1.50.
• -110 becomes 1 + (100 ÷ 110) = 1.909.

Converting a decimal price back to American

• Decimal of 2.00 or more: American = (decimal − 1) × 100, shown with a plus sign.
• Decimal under 2.00: American = −100 ÷ (decimal − 1).

Worked example: a three-leg parlay

Say you combine three legs:

• Leg 1: -110, which is 1.909 in decimal
• Leg 2: +150, which is 2.50 in decimal
• Leg 3: -200, which is 1.50 in decimal

Multiply them: 1.909 × 2.50 × 1.50 = 7.159.

On a $10 stake, the total return is $71.59, which is $61.59 of profit. Converted back to American odds, that parlay is about +616.

You can check the same answer with implied probability. A price of -110 implies 52.4%, +150 implies 40.0%, and -200 implies 66.7%. Multiply them and you get 0.524 × 0.40 × 0.667 = 13.97%. Divide 1 by 0.1397 and you land on 7.16 again. In other words, the parlay price is simply the sportsbook's combined probability that every leg wins.

Parlay payout chart: what -110 legs pay

Here is what a $10 stake returns when every leg is priced at -110. The return includes your stake.

• 2 legs: +264, returns $36.45
• 3 legs: +596, returns $69.58
• 4 legs: +1228, returns $132.83
• 5 legs: +2436, returns $253.59
• 6 legs: +4741, returns $484.13

The payouts grow fast, and that is exactly why parlays are attractive. The next section is about the other side of that growth.

Why long parlays cost more than they look

A market priced at -110 on both sides implies 52.38% for each outcome. Add the two together and you get 104.76%. The extra 4.76 points are the sportsbook's margin, often called the vig or juice.

On a single -110 bet, that margin costs you about 4.5% of every dollar staked if the true chance is exactly 50%. A parlay multiplies the margin along with the payout. If every leg were a true 50/50 shot priced at -110, the expected return would shrink like this:

• 1 leg: about -5%
• 2 legs: about -9%
• 3 legs: about -13%
• 4 legs: about -17%
• 5 legs: about -21%
• 6 legs: about -24%

Treat that as an illustration, not a prediction. Real legs are rarely exactly 50/50 and real prices vary from book to book. The direction is what matters: every leg you add multiplies the sportsbook's margin together with your payout. A parlay only pays off over time when your legs are genuinely better than their prices say, which is the same thing as finding value.

What can make the real payout differ from your math

• Pushes and voids. If a leg pushes or is voided, most US sportsbooks drop it and pay the remaining legs at the reduced odds. Check your book's house rules.
• Same-game parlays. Legs from the same game tend to be related, so books price them with their own adjustments. You cannot multiply the displayed leg prices and expect the same number.
• Odds boosts. If a book offers a boosted parlay, compare the boosted price with the plain multiplied price so you know how much the boost is really worth.
• Rounding. Books round decimal and American prices differently, so a few cents of difference is normal.

Check the price before you place the bet

Doing this arithmetic by hand for every slip gets old quickly. Parlitify is a sports betting analysis app that does it for you: add your legs to the parlay analyzer and see the combined odds and the payout for your stake as you go. It also grades each leg, so you can see which ones are carrying the parlay and which ones are dragging it down.

If you would rather start from a suggestion, the AI Parlay Builder lets you pick the number of legs and a risk level (Safer, Balanced or Value) and builds a slip from today's games. You can edit any leg afterwards.

To be clear about what it is: Parlitify is an analysis tool, not a sportsbook. It does not take bets, and no tool can promise a winning parlay. What it can do is show you the real combined price and the weak legs before your money is on the line.

Parlay odds FAQ

How do you calculate parlay odds with American odds?

Convert each American price to decimal, multiply the decimals, and convert the product back. For example, +150 (2.50) and -200 (1.50) multiply to 3.75, which is +275.

What is the formula for a parlay payout?

Total return = stake × (decimal leg 1 × decimal leg 2 × decimal leg 3 …). Profit = total return − stake.

Are parlay odds the same at every sportsbook?

No. Each leg is priced separately by each book, so the same slip can pay differently depending on where you place it. Comparing the combined price across books before you bet is worthwhile.

Why does my sportsbook show a different payout than my calculation?

The usual reasons are rounding, same-game parlay pricing, odds boosts, or a leg that was voided. If the gap is large, check the bet slip's terms.

Is a parlay a good bet?

It is a higher-variance bet that compounds the sportsbook's margin with every leg, as the chart above shows. It makes sense when each leg has value on its own and you keep the stake small. It makes much less sense as a way to chase losses.

How many legs should a parlay have?

There is no single right answer, but the numbers above show the cost rising with every leg. Many bettors keep slips to two or three legs and only add one when it genuinely earns its place.

Bet responsibly

Only stake money you can afford to lose, and set limits before you start. You can read our responsible gambling page for tools and resources. In the US, the National Problem Gambling Helpline is 1-800-522-4700. You must be of legal betting age where you live.

Ready to put this to use? See the AI parlay builder, built from live odds.