Free calculator
Parlay Calculator
Legs
American1.909 decimal
American1.909 decimal
American1.909 decimal
Enter the other side of each leg for the exact cost
The price on the opposite outcome at the same book. A leg left blank is priced at the measured hold instead.
American, decimal, fractional or a percent: -110, 2.50, 10/11, 52%
American, decimal, fractional or a percent: -110, 2.50, 10/11, 52%
American, decimal, fractional or a percent: -110, 2.50, 10/11, 52%
What the extra legs cost
Estimate: a leg without its other side is assumed to carry 4.88% of hold, the median two-way moneyline hold at the books Agatha tracks over the 30 days since August 28, 2026.
3 legs at a combined +596 return $69.58 on a $10.00 stake, $59.58 net.
How to use it
- Enter your stake.
- Type each leg's odds in any format: -110, +150, 2.50, 5/2 or 40%. The field names the format it read. Add legs with the button, up to fifteen.
- As games finish, set a leg to Won, Push, Void or Lost. The ticket reprices the way most books settle it.
- Open the other-side panel and enter the opposite price of each leg to see exactly what the ticket costs against fair odds.
The formula
Turn every leg into decimal odds, multiply them together, then multiply by the stake.
combined decimal = d1 x d2 x ... x dn return = stake x combined decimal net = return - stake break-even win rate = 1 / combined decimal
Three legs at -110: each is 1 + 100/110 = 1.9091 in decimal. Multiplied together they come to 6.9579, so a $10.00 stake returns $69.58, which is $59.58 net. That is +596 in American odds, and the ticket needs to win 14.4% of the time to break even.
The cost: in a -110 / -110 market each side is really a 50.0% chance, so the fair price of three such legs is +700 and $10.00 would return $80.00. The ticket pays $69.58. That gap, 13.0% of the stake on average, is the book's margin taken three times over; a single leg gives up 4.5%.
Edge cases
- Push and void legs drop out and the ticket reprices from the legs left: in the example, a push on the middle leg turns it into a two-leg parlay at +264 that returns $36.45. One leg left grades as a single bet, and no legs left means no bet, so the stake comes back. That is the rule Agatha grades her own parlays by.
- A lost leg loses the ticket, even when every other leg won.
- Legs from the same game are correlated, and books price same-game parlays their own way. This calculator assumes independent legs, so it prices a ticket built from different games.
- Some books round each leg's decimal odds before multiplying them, so a quoted payout can differ from this one by a few cents.
From Agatha's record
Parlays built from Agatha's picks
Every same-day parlay that could have been built from Agatha's graded picks: at most one pick per game, at the prices frozen when each pick was listed, with pushes repriced by the rule above.
| Legs | Parlays | Cashed | ROI |
|---|---|---|---|
| 1 (singles) | 2,591 | 58.5% | -2.16% |
| 2 | 114,050 | 33.3% | -5.59% |
| 3 | 3,810,995 | 18.6% | -9.33% |
| 4 | 105,033,186 | 10.2% | -12.44% |
| 5 | 2,466,493,983 | 5.7% | -14.33% |
The same picks returned -2.16% as singles and -14.33% stacked 5 legs deep: every leg added took more, because each one brings its own margin.
Busy days contribute far more combinations than quiet ones, so a few big slates weigh most in the longer rows.
The guide Are parlays worth it? works through why.
As of . See the full track record
Parlay calculator questions
How is a parlay payout calculated?
Multiply the decimal odds of every leg, then multiply by your stake. Three legs at -110 (1.9091 each) come to 6.9579, so $10.00 returns $69.58.
What happens to a parlay if one leg pushes?
The pushed leg drops out and the parlay pays at the combined odds of the legs left, so a two-leg parlay with a push becomes a single bet on the other leg. A void leg (a cancelled or postponed game) is settled the same way, though books set different windows before they void a postponed game. How Agatha grades has the rule she settles her own parlays by.
Why does a parlay pay less than the true odds?
Every leg carries the book's margin, and multiplying the legs multiplies the margin. Two -110 legs pay 3.64 times the stake where the fair price is 4.00; three pay 6.96 against a fair 8.00. The no-vig calculator shows the fair price of any single leg.
Are same-game parlays priced the same way?
No. Legs from one game move together (a big passing day and the over, say), so books price same-game parlays with their own correlation models and usually with a larger margin. Multiplying the legs, as this calculator does, is only right for legs from different games.
What win rate does a parlay need to break even?
One divided by the combined decimal odds. Three -110 legs need to cash 14.4% of the time. Use the odds converter for the break-even rate of any single price.