World Series Betting for People Who Only Watch in October
You have not watched a full game since last Halloween and the playoffs start ...
Sep 17, 2026Parlays are the most popular and most misunderstood bet type in sports betting. This calculator not only computes your potential payout, but also runs a full Monte Carlo simulation to show you the real expected value when you enter your true win probabilities for each leg.
Sportsbooks calculate parlay payouts by multiplying the decimal odds of each leg. Since each individual line already has vig baked in, that vig compounds with every leg you add. A 3-leg parlay at -110 each has roughly 13% house edge compared to just 4.5% on a straight bet. The Monte Carlo simulator runs 10,000 trials to show you exactly how this edge plays out over time.
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