Parlay Odds Calculator
Calculate the combined payout, total odds, and win probability of a multi-leg parlay bet. Use it before placing any parlay to see exactly how much you stand to win and how unlikely it is to hit.
About this calculator
A parlay chains multiple independent bets together: all legs must win for the parlay to pay out. The combined decimal odds are found by multiplying each leg's decimal odds together: Parlay Odds = leg1Odds × leg2Odds × leg3Odds × … Total Payout = Bet Amount × Parlay Odds. The combined win probability (assuming independence) is: P(win) = p1 × p2 × p3, where each p is derived from the leg's implied probability. Because sportsbooks build a margin (vig) into each leg's odds, parlay payouts are always less than fair value — the vig compounds with each added leg. A 3-leg parlay multiplies three separate vig deductions, making the house edge grow substantially with parlay length. Despite this, parlays remain popular because a small stake can produce a large return.
How to use
Say you want a 3-leg parlay: Leg 1 odds = 1.91, Leg 2 odds = 1.91, Leg 3 odds = 2.10, with a $20 bet. Step 1 — Enter each leg's decimal odds and betAmount = $20. Step 2 — Combined odds = 1.91 × 1.91 × 2.10 = 7.66 (rounded). Step 3 — Total payout = $20 × 7.66 = $153.21. Step 4 — Profit = $153.21 − $20 = $133.21. Step 5 — Combined implied probability = (1/1.91) × (1/1.91) × (1/2.10) ≈ 13.1%.
Frequently asked questions
How are parlay odds calculated across multiple legs?
Parlay odds are calculated by multiplying the decimal odds of each individual leg together. For example, two legs at 2.00 each produce combined parlay odds of 4.00. Three legs at 2.00 each produce 8.00. Each additional leg both increases the potential payout and multiplies the difficulty of winning, since every leg must succeed. Sportsbooks apply their margin to each individual leg's price, so the compounding vig makes parlays mathematically unfavorable compared to single-game bets at the same total risk.
What is the difference between a parlay and a teaser bet?
A parlay multiplies the odds of all legs at their listed prices, offering higher payouts but requiring every leg to win outright. A teaser allows you to adjust each point spread by a fixed number of points (typically 6 in football) in your favor, which increases your chance of each leg winning but at significantly reduced parlay odds. Teasers sacrifice payout size for improved win probability per leg. Both formats compound risk across legs, but teasers are often used as a strategic tool to cross key numbers in football point spreads.
Why do sportsbooks prefer when bettors play parlays?
Parlays are among the most profitable products for sportsbooks because the vig compounds with every leg added. On a single -110 bet, the implied probability already exceeds 50% (about 52.4%), building in a margin of roughly 4.5%. When you parlay three such bets, the sportsbook's margin compounds across all three, widening the gap between the fair payout and the actual payout significantly. Studies estimate that a 3-leg parlay of -110 legs carries an effective house edge of around 12–17%, compared to roughly 4.5% on a single wager.