What this page sets up
The calculator opens on the parlay tab with four legs at −110 and a 10 stake. Type each leg’s odds in American, decimal or fractional form (pick the format above the legs), add up to 20 legs, and mark legs Won, Push / void or Lost as the games finish. The result shows the payout, the combined odds in all three formats and the implied chance that every open leg wins.
Reading the result
The payout includes your stake, so profit is the payout minus the stake. The implied chance is the chance the prices suggest, before the book’s margin is taken out, so the real chance of hitting is a little lower. The table under this text shows how quickly both the payout and the book’s share grow as you add −110 legs.
Same-game parlays and correlated legs
Same-game parlays price legs that depend on each other, for example a team winning and its quarterback throwing for 300 yards. Books adjust those prices, so a same-game parlay usually pays less than the product of the single-bet odds. To check what you’re getting, compare the book’s price with the combined odds shown here: the difference is the adjustment. Legs from different games are usually independent, and for those the product shown here is what the book pays.
Parlays at −110 a leg
Combined odds, the return on a $10 stake, the implied chance of every leg winning, and how much of fair value the parlay pays when both sides of each leg are −110.
| Legs | American | Decimal | $10 returns | Implied chance | Share of fair value |
|---|---|---|---|---|---|
| 2 | +264.46 | 3.645 | $36.45 | 27.44% (1 in 3.6) | 91.1% |
| 3 | +595.79 | 6.958 | $69.58 | 14.37% (1 in 7.0) | 87% |
| 4 | +1228.33 | 13.283 | $132.83 | 7.53% (1 in 13.3) | 83% |
| 5 | +2435.91 | 25.359 | $253.59 | 3.94% (1 in 25.4) | 79.2% |
| 6 | +4741.27 | 48.413 | $484.13 | 2.07% (1 in 48.4) | 75.6% |
| 7 | +9142.43 | 92.424 | $924.24 | 1.08% (1 in 92.4) | 72.2% |
| 8 | +17544.64 | 176.446 | $1,764.46 | 0.57% (1 in 176.4) | 68.9% |
| 9 | +33585.23 | 336.852 | $3,368.52 | 0.3% (1 in 336.9) | 65.8% |
| 10 | +64208.16 | 643.082 | $6,430.82 | 0.16% (1 in 643.1) | 62.8% |
Maths only, not betting advice. If gambling stops being fun, free confidential help is listed on the odds calculator page.