📘 Published November 3, 2026 · 5 min read
Parlays explained: how the odds multiply, and so does the margin
What a parlay is, how its price is calculated, why every extra leg makes it harder to win and more expensive, and what to check before a same-game parlay: the Teacher's guide, with the calculator.
One ticket, every leg must win
A parlay (or accumulator) puts two or more selections on a single ticket. If one leg loses, the whole ticket loses; if every leg wins, the winnings of each leg roll into the next.
That is why a parlay pays so much: you are not making three bets, you are making one bet that needs three things to happen.
How the price is calculated
In decimal odds, the price of a parlay is the product of the prices of its legs.
| Legs at 1.91 | Parlay price | Return on $10 | Implied chance |
|---|---|---|---|
| 1 | 1.91 | $19.10 | 52.4% |
| 2 | 3.65 | $36.48 | 27.4% |
| 3 | 6.97 | $69.68 | 14.4% |
The implied chance multiplies the same way: 1 divided by the price. Each leg at 1.91 is a little over one chance in two; three of them together are about one chance in seven.
💡 American odds? Convert each leg to decimal first (-110 is 1.91, +150 is 2.50), or let the calculator do it.
- Leg 1-110 1.91
- Leg 2-110 1.91
- Leg 3+150 2.50
About 1 time in 9: a dream ticket. Small stake only.
The margin multiplies too
On a game priced 1.91 on both sides, the two implied chances add up to 104.7%: the sportsbook returns 95.5% of the stakes to bettors on average and keeps the rest.
In a parlay, that payout multiplies with each leg: 95.5% on one leg, 91.2% on two legs, 87.1% on three. The more legs, the bigger the share the sportsbook keeps.
That is the price of the big payout: a parlay is entertainment, rarely the cheapest way to bet.
Same-game parlays
A same-game parlay combines several bets on one game: the winner, the total, a player's points. These legs are linked: if a team wins big, its top scorer has probably scored.
Because the legs are linked, the price of the ticket can differ from the simple product of the legs. Before you confirm, compare the price offered with the product shown by our calculator.
Before you confirm the ticket
- Read the sportsbook's house rules: they say what happens to the ticket if a game is postponed or a leg ends in a tie.
- Take the best price of each leg: on a parlay, a small gap on each leg adds up.
- Keep the stake small: a parlay loses more often than it wins, by design.
Frequently asked questions
How is a parlay's price calculated?
In decimal odds, it is the product of the legs' prices: three legs at 1.91 make 6.97, so $10 returns $69.68.
What happens if one leg of a parlay loses?
The whole ticket loses: a parlay only wins if every leg wins.
Why is a parlay more expensive than a single bet?
The sportsbook's margin multiplies with each leg: three legs that each return 95.5% to bettors make a ticket that returns about 87.1%.
What happens to a parlay if a game is postponed or a leg is a tie?
The sportsbook's house rules decide: read them before you confirm the ticket.
Bet responsibly
Betting is paid entertainment, for adults only (19 and over in Ontario, 18 and over in Alberta), never a way to make money. Set a budget before you start and stick to it, whatever happens.
💡 Free help, 24/7: ConnexOntario 1-866-531-2600 in Ontario, Addiction Helpline 1-866-332-2322 in Alberta.
Odds move fast: always check the price on the sportsbook's site. Information, not betting advice.