Parlay Builder

A parlay combines several bets into one. Every leg has to win or the whole ticket loses, and in exchange the payout is far larger than any single leg would pay. The combined odds are the legs multiplied together, not added — which is why a fourth leg can double a payout while quietly halving your chance of collecting anything.

To see the real number, convert each leg to decimal odds, multiply them, and convert back. Three legs at -110 each are roughly 1.91 × 1.91 × 1.91 ≈ 6.96, so about +596. That looks generous next to a single -110 bet, but the true probability of all three landing is about 14%, and a fair price for a 14% shot would be closer to +614. The gap is the sportsbook's margin.

This is the part worth understanding:the vig compounds. A sportsbook's edge on one -110 bet is a few percent; across a four-leg parlay that edge is applied four times over. That is precisely why books promote parlays so heavily and why parlay hold percentages are several times higher than straight-bet hold. Parlays are not inherently a mistake, but they are a worse price per unit of risk than the same bets placed individually, and correlated legs are the only common case where that math shifts back toward the bettor.

Use the builder above to see combined odds, implied probability and payout update as you add legs — the win probability is the number to watch, not the payout. For staking, the Kelly calculator sizes bets against your edge, and the FAQ explains implied probability and how the vig is removed to find a fair price.