Combine 2 or more legs and get the parlay odds, the total payout and the profit on your stake.
A parlay ties several legs into one bet: every leg has to hit for it to pay. The parlay odds come from multiplying the decimal odds of each leg. That's why the payout grows fast — and so does the risk.
The total payout is your stake times the parlay odds; the net profit is that payout minus what you put up. If you prefer American odds, switch the format and the calculator converts them for you.
Every leg you add multiplies the payout, and it multiplies the book's margin along with it. With four legs at ‑110 the parlay odds are 13.283, so a $100 stake would pay $1,328.33. If all four were exact coin flips, the fair price would be 2.00 × 2.00 × 2.00 × 2.00 = 16.00 and the payout $1,600.
That $271.67 gap isn't rounding: it's each leg's commission, compounded. At ‑110 the book pays 95.45% of the fair price, and four times over that's 0.9545 × 0.9545 × 0.9545 × 0.9545 = 0.830 — the 83% you see comparing $1,328.33 with $1,600. A parlay isn't the same commission at higher risk: it's more commission at higher risk.
To read the result, invert the parlay odds: 1 ÷ 13.283 = 7.53%, the probability the book is putting on the whole ticket. If your four legs really were coin flips, the true probability would be 6.25%, one in sixteen. The distance between 7.53% and 6.25% is what the ticket costs you.
Informational tool only. Not a sportsbook and not investment advice.