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Parlay Calculator
Enter each leg's odds for the price, payout and win probability. The implied probability chart sits with it, and there's a parlay odds chart below.
How parlay odds work
A parlay multiplies the decimal odds of every leg. Two legs at −110 (decimal 1.909) combine to 1.909 × 1.909 = 3.645, which is +264. Your payout grows fast. So does something else:
Every leg multiplies the vig, too. A single −110/−110 market carries about 4.5% of book margin. Stack legs and the tax compounds:
| Legs | Parlay odds | Implied chance | Book's hold | $10 pays | $100 pays |
|---|---|---|---|---|---|
| 1 | −110 | 52.4% | 4.5% | $19 | $191 |
| 2 | +264 | 27.4% | 8.9% | $36 | $364 |
| 3 | +596 | 14.4% | 13.0% | $70 | $696 |
| 4 | +1228 | 7.5% | 17.0% | $133 | $1,328 |
| 5 | +2436 | 3.9% | 20.8% | $254 | $2,536 |
| 6 | +4741 | 2.1% | 24.4% | $484 | $4,841 |
| 7 | +9142 | 1.08% | 27.8% | $924 | $9,242 |
| 8 | +17545 | 0.57% | 31.1% | $1,764 | $17,645 |
| 9 | +33585 | 0.30% | 34.2% | $3,369 | $33,685 |
| 10 | +64208 | 0.16% | 37.2% | $6,431 | $64,308 |
Payout is the full return including your stake. "Implied chance" is what the −110 prices imply with the vig left in: 52.4% a leg, multiplied across the legs. The hold column measures each row against a true coin flip a leg: at ten legs the book keeps more than a third of the ticket's value before a single game is played.
That's the whole reason sportsbooks market parlays so hard, and it's why the calculator shows a win probability next to the payout. The probability it gives you is the one implied by the price you typed in, which means the vig is still inside it. Look up that same percentage in the implied probability chart on this page and you're reading the book's number, not a true one.
One honest caveat: multiplying legs assumes they're independent. Same-game parlay legs are correlated, which is why books reprice SGPs internally. For an SGP, treat the number this calculator gives you as the independent-leg baseline, not the real price.
What a parlay is worth against its fair price
Multiplying decimal odds, which is what the calculator above does, gives you what the ticket pays. It does not tell you what the ticket is worth, and those are different numbers.
To get the second one you need each leg's price with the book's margin taken out, across every book quoting that market. Here it is on three real props, all in different games, priced on September 11, 2026. These three are a frozen example rather than a live read, and the prices are the ones that were really up that day:
| Leg | Game | Best price | Fair chance |
|---|---|---|---|
| Josh Allen, over 31.5 rushing yards | Bills at Texans | -115 | 49.9% |
| Tyler Shough, over 243.5 passing yards | Saints at Lions | -113 | 49.7% |
| Marvin Harrison Jr., over 48.5 receiving yards | Cardinals at Rams | -114 | 50.0% |
Each leg is close to a coin flip once the margin comes off, and each is priced around -115. Multiply the three prices and the parlay pays +562, so $100 returns $662. Multiply the three fair chances instead and the ticket wins 12.4% of the time, which is worth +706, or $806 on the same $100.
The difference is $145 on a $100 ticket, about 18% of what the bet is worth. Each leg on its own was held around 7%. Three of them together are held 18%, because the margin multiplies exactly the way the odds do. That is the whole reason a parlay is a better product for the book than for you.
None of that makes a parlay unplayable. It makes the price the thing to check first, which is why the Lab shows the best price at your books on every line, free.
Implied probability chart, every half point
The same conversion at 0.5% resolution, 0 to 100. A price of −110 is 52.4%; anything you are laying more than even money on needs to win more than half the time before the vig is counted.
- 0.0%na
- 0.5%+19900
- 1.0%+9900
- 1.5%+6567
- 2.0%+4900
- 2.5%+3900
- 3.0%+3233
- 3.5%+2757
- 4.0%+2400
- 4.5%+2122
- 5.0%+1900
- 5.5%+1718
- 6.0%+1567
- 6.5%+1438
- 7.0%+1329
- 7.5%+1233
- 8.0%+1150
- 8.5%+1076
- 9.0%+1011
- 9.5%+953
- 10.0%+900
- 10.5%+852
- 11.0%+809
- 11.5%+770
- 12.0%+733
- 12.5%+700
- 13.0%+669
- 13.5%+641
- 14.0%+614
- 14.5%+590
- 15.0%+567
- 15.5%+545
- 16.0%+525
- 16.5%+506
- 17.0%+488
- 17.5%+471
- 18.0%+456
- 18.5%+441
- 19.0%+426
- 19.5%+413
- 20.0%+400
- 20.5%+388
- 21.0%+376
- 21.5%+365
- 22.0%+355
- 22.5%+344
- 23.0%+335
- 23.5%+326
- 24.0%+317
- 24.5%+308
- 25.0%+300
- 25.5%+292
- 26.0%+285
- 26.5%+277
- 27.0%+270
- 27.5%+264
- 28.0%+257
- 28.5%+251
- 29.0%+245
- 29.5%+239
- 30.0%+233
- 30.5%+228
- 31.0%+223
- 31.5%+217
- 32.0%+213
- 32.5%+208
- 33.0%+203
- 33.5%+199
- 34.0%+194
- 34.5%+190
- 35.0%+186
- 35.5%+182
- 36.0%+178
- 36.5%+174
- 37.0%+170
- 37.5%+167
- 38.0%+163
- 38.5%+160
- 39.0%+156
- 39.5%+153
- 40.0%+150
- 40.5%+147
- 41.0%+144
- 41.5%+141
- 42.0%+138
- 42.5%+135
- 43.0%+133
- 43.5%+130
- 44.0%+127
- 44.5%+125
- 45.0%+122
- 45.5%+120
- 46.0%+117
- 46.5%+115
- 47.0%+113
- 47.5%+111
- 48.0%+108
- 48.5%+106
- 49.0%+104
- 49.5%+102
- 50.0%+100
- 50.5%−102
- 51.0%−104
- 51.5%−106
- 52.0%−108
- 52.5%−111
- 53.0%−113
- 53.5%−115
- 54.0%−117
- 54.5%−120
- 55.0%−122
- 55.5%−125
- 56.0%−127
- 56.5%−130
- 57.0%−133
- 57.5%−135
- 58.0%−138
- 58.5%−141
- 59.0%−144
- 59.5%−147
- 60.0%−150
- 60.5%−153
- 61.0%−156
- 61.5%−160
- 62.0%−163
- 62.5%−167
- 63.0%−170
- 63.5%−174
- 64.0%−178
- 64.5%−182
- 65.0%−186
- 65.5%−190
- 66.0%−194
- 66.5%−199
- 67.0%−203
- 67.5%−208
- 68.0%−213
- 68.5%−217
- 69.0%−223
- 69.5%−228
- 70.0%−233
- 70.5%−239
- 71.0%−245
- 71.5%−251
- 72.0%−257
- 72.5%−264
- 73.0%−270
- 73.5%−277
- 74.0%−285
- 74.5%−292
- 75.0%−300
- 75.5%−308
- 76.0%−317
- 76.5%−326
- 77.0%−335
- 77.5%−344
- 78.0%−355
- 78.5%−365
- 79.0%−376
- 79.5%−388
- 80.0%−400
- 80.5%−413
- 81.0%−426
- 81.5%−441
- 82.0%−456
- 82.5%−471
- 83.0%−488
- 83.5%−506
- 84.0%−525
- 84.5%−545
- 85.0%−567
- 85.5%−590
- 86.0%−614
- 86.5%−641
- 87.0%−669
- 87.5%−700
- 88.0%−733
- 88.5%−770
- 89.0%−809
- 89.5%−852
- 90.0%−900
- 90.5%−953
- 91.0%−1011
- 91.5%−1076
- 92.0%−1150
- 92.5%−1233
- 93.0%−1329
- 93.5%−1438
- 94.0%−1567
- 94.5%−1718
- 95.0%−1900
- 95.5%−2122
- 96.0%−2400
- 96.5%−2757
- 97.0%−3233
- 97.5%−3900
- 98.0%−4900
- 98.5%−6567
- 99.0%−9900
- 99.5%−19900
- 100.0%∞
Parlay odds chart
What a parlay pays at common leg prices. Read down for the number of legs, across for what each leg is priced at. Every cell is the combined American price of that ticket.
| Legs | −120 | −110 | −105 | +100 | +150 | +200 |
|---|---|---|---|---|---|---|
| 2 | +236 | +264 | +281 | +300 | +525 | +800 |
| 3 | +516 | +596 | +644 | +700 | +1463 | +2600 |
| 4 | +1030 | +1228 | +1353 | +1500 | +3806 | +8000 |
| 5 | +1971 | +2436 | +2737 | +3100 | +9666 | +24200 |
| 6 | +3697 | +4741 | +5438 | +6300 | +24314 | +72800 |
| 7 | +6861 | +9142 | +10713 | +12700 | +60935 | +218600 |
| 8 | +12662 | +17545 | +21011 | +25500 | +152488 | +656000 |
| 9 | +23298 | +33585 | +41117 | +51100 | +381370 | +1968200 |
| 10 | +42796 | +64208 | +80372 | +102300 | +953574 | +5904800 |
Mixed-price tickets are the normal case and the chart cannot show every combination, so put your actual legs into the calculator above. The chart is for the shape of the thing: notice that the jump from four legs to five is bigger than the jump from one to two, which is why the payout looks so attractive and why the hold in the table above climbs at the same time.
Parlay questions
Why do sportsbooks push parlays so hard?
Because vig compounds per leg. A bettor grinding single −110 bets pays ~4.5% margin; the same bettor on 4-leg parlays pays ~17%. Parlays are the book's highest-margin product, dressed up as a lottery ticket.
Can I use this for same-game parlays?
For the price and payout, yes. SGP legs are correlated, though (a QB's passing yards and his team winning move together), and books reprice SGPs internally, so read the result as the independent-leg baseline.
What does a 5-team parlay pay?
With every leg at −110, a 5-team parlay is +2436, so $100 returns $2,536 including your stake. The honest half of that answer is two more numbers: if each leg is a true coin flip, the ticket wins about 3.1% of the time, and the book's hold on it is about 20.8%. The chart above runs from 1 to 10 legs.
Why is a same-game parlay priced worse than this calculator says?
Because the legs are not independent. This calculator multiplies them as if they were, which gives you the independent-leg baseline. A book quoting an SGP prices the correlation between the legs, and its number is usually lower. Compare the two and the gap is real information, but be careful what you call it: the gap contains the book's correlation adjustment, its vig, its rounding, and any difference in the individual leg prices it used. It is not a clean measure of correlation and nobody who tells you otherwise has separated those four things either.
What is a fair parlay price?
The product of each leg's no-vig win probability, converted back to odds. If two legs are each a fair 50% (+100 no-vig), the fair parlay is 25%, which is +300. Anything less than +300 on that ticket is vig.
Related
Got a profit boost to put on a slip? Price it properly first. That's what the desk does every morning.