If the American odds are negative (-110, -220, -650, etc.), use this formula (disregard the negative symbol that precedes the numeric odds): If the American odds are positive (+110, +130, +400, etc.), use this formula: To do this, let’s go back to ninth-grade algebra. Here’s the step-by-step process, using a hypothetical $50 wager:ġ) Convert the American odds from each leg of your parlay into decimal odds. Fortunately, it’s not high-level trigonometry. Understanding how to calculate parlay odds requires doing some math. Here is a list of our partners who offer products that we have affiliate links for.

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Whats a parlay in ports betting