What is Double Bet? Double Bet Explained in 2 Minutes
Jesse M. Cox Last Verified
26/06/2026
A double bet is a single wager that combines two separate selections. Both selections must win for the bet to pay out. If either one loses, the entire bet loses.
You will come across this term on most US sportsbooks, often in the parlay builder or multi-bet section of the site. This page walks through exactly how a double bet works, shows you the math with a real NFL and NBA example, and explains when it makes sense to use one.
What does double bet mean?
A double bet links two individual picks into one combined wager. Instead of placing two separate single bets, you roll the potential winnings from the first selection directly into the second. The sportsbook multiplies the odds of both selections together, which means the possible payout is higher than if you bet each game on its own. The trade-off is straightforward: you need both outcomes to go your way. One wrong result and you lose your entire stake. The stake is the amount of money you put down on the bet.
The double is the simplest form of a multi-bet. It is the building block that leads to larger combinations like a treble (three selections) or a full accumulator (four or more selections). Some sportsbooks in the US label this type of bet a two-leg parlay rather than a "double," but the mechanics are identical.
Real-life example
Say it is an NFL Sunday and you want to back two teams. You like the Kansas City Chiefs to win at -130, and you also like the Philadelphia Eagles to win at +110. Those are American moneyline odds - the minus sign means you risk that amount to win $100, and the plus sign means a $100 stake wins that amount.
To work out the payout on a double, it helps to convert both prices to decimal odds first. Decimal odds show your total return per dollar wagered, including your original stake.
-130 converts to decimal odds of 1.77 (divide 100 by 130, then add 1). +110 converts to decimal odds of 2.10 (divide 110 by 100, then add 1). Multiply the two together: 1.77 x 2.10 = 3.72. That is the combined decimal price for your double.
You place a $50 stake on the double. If both teams win, your total payout is $50 x 3.72 = $186.00. Your profit is $186.00 minus your $50 stake, which comes to $136.00. If you had placed two separate $50 single bets and both won, your profit would be roughly $88.50 combined. The double pays considerably more, but only because you took on more risk by linking the two results together.
If the Chiefs win but the Eagles lose, you receive nothing. The second selection kills the entire bet.
How double bets are used
Most bettors encounter the double bet inside a sportsbook's parlay builder. You add two selections to your bet slip and the site automatically calculates the combined odds and potential payout. You will also see the double used in NFL betting, NBA betting, and across most major US sports markets including moneylines, point spreads, and totals. A point spread is a handicap the sportsbook sets to even out a matchup between two teams.
One thing worth knowing: the sportsbook builds a margin into every line it offers. That margin, sometimes called the juice or vig, means the true odds are always slightly in the house's favour. When you combine two selections in a double, the sportsbook's edge applies to both legs, so the combined advantage it holds over you is larger than on a single bet. The higher potential payout is real, but so is the increased risk. Going into a double with that knowledge is part of betting responsibly.
Related terms
If you want to add a third selection to your double, that becomes a treble - same idea, one more leg. A parlay is the broad US term for any multi-selection bet, including doubles and trebles. For a single, stand-alone pick with no combinations involved, that is called a single bet - the simplest wager of all and the best starting point for beginners. If you are curious about all multi-leg formats together, the term multiple covers the whole family.
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FAQs
Is a double bet the same as a two-leg parlay?
Yes, in practice they are the same thing. US sportsbooks typically call it a two-leg parlay, while the term double is more common in other parts of the world. The math works identically - both selections must win, and the odds are multiplied together.
Can I place a double bet on two different sports?
Most sportsbooks allow this. You could combine an NFL pick with an NBA pick in a single double bet, for example. The same rules apply - both legs must win for you to collect a payout.
What happens if one leg of my double bet is cancelled or postponed?
If a game is cancelled or a market is voided, most sportsbooks will remove that leg and settle the remaining leg as a single bet. It is worth checking the rules of whichever sportsbook you are using before you place the wager, as policies can vary slightly.
