{
  "slug": "parlay-odds",
  "title": "Parlay Odds & Payout Calculator",
  "heading": "Parlay Odds Calculator",
  "category": "math",
  "url": "https://www.revenuelab.fyi/toolbox/parlay-odds",
  "summary": "Combine American odds into a parlay payout and implied probability.",
  "description": "Multiply decimal odds across legs to get combined odds, total payout, and the implied win probability of the whole ticket — usually much lower than it feels.",
  "formula": "Decimal odds multiply; implied probability = 1 ÷ combined decimal odds.",
  "dateModified": "2026-09-30",
  "run_url": "https://www.revenuelab.fyi/api/public/calc?tool=parlay-odds",
  "inputs": [
    {
      "id": "stake",
      "label": "Stake",
      "kind": "number",
      "hint": null,
      "default": 50,
      "unit": "$",
      "min": 0,
      "max": null
    },
    {
      "id": "o1",
      "label": "Leg 1 (American odds)",
      "kind": "number",
      "hint": null,
      "default": -110,
      "unit": null,
      "min": null,
      "max": null
    },
    {
      "id": "o2",
      "label": "Leg 2",
      "kind": "number",
      "hint": null,
      "default": -110,
      "unit": null,
      "min": null,
      "max": null
    },
    {
      "id": "o3",
      "label": "Leg 3",
      "kind": "number",
      "hint": null,
      "default": 150,
      "unit": null,
      "min": null,
      "max": null
    },
    {
      "id": "o4",
      "label": "Leg 4 (0 to skip)",
      "kind": "number",
      "hint": null,
      "default": 0,
      "unit": null,
      "min": null,
      "max": null
    }
  ],
  "outputs": [
    {
      "id": "payout",
      "label": "Total payout",
      "format": "currency",
      "hint": null,
      "primary": true
    },
    {
      "id": "profit",
      "label": "Profit",
      "format": "currency",
      "hint": null,
      "primary": false
    },
    {
      "id": "combined",
      "label": "Combined decimal odds",
      "format": "decimal",
      "hint": null,
      "primary": false
    },
    {
      "id": "american",
      "label": "Combined American odds",
      "format": "decimal",
      "hint": null,
      "primary": false
    },
    {
      "id": "implied",
      "label": "Implied win probability",
      "format": "percent",
      "hint": null,
      "primary": false
    }
  ],
  "worked_example": {
    "inputs": [
      "Stake: 50 $",
      "Leg 1 (American odds): -110",
      "Leg 2: -110",
      "Leg 3: 150",
      "Leg 4 (0 to skip): 0"
    ],
    "outputs": [
      "Total payout: $455.58",
      "Profit: $405.58",
      "Combined decimal odds: 9.112",
      "Combined American odds: 811",
      "Implied win probability: 10.98%"
    ]
  },
  "how_to": {
    "title": "How to use this",
    "steps": [
      "Enter stake ($).",
      "Enter leg 1 (american odds).",
      "Enter leg 2.",
      "Enter leg 3.",
      "Enter leg 4 (0 to skip).",
      "Read your total payout on the right — it updates as you type.",
      "Hit Share to keep the scenario or send it to someone."
    ]
  },
  "scenarios": [
    {
      "name": "Conservative",
      "description": "Lower-end numbers — what if things land soft?",
      "values": {
        "stake": 30,
        "o1": -65,
        "o2": -65,
        "o3": 90,
        "o4": 0
      }
    },
    {
      "name": "Typical",
      "description": "Defaults — the most common real-world setup.",
      "values": {
        "stake": 50,
        "o1": -110,
        "o2": -110,
        "o3": 150,
        "o4": 0
      }
    },
    {
      "name": "Ambitious",
      "description": "Higher-end numbers — what if things really pop?",
      "values": {
        "stake": 80,
        "o1": -175,
        "o2": -175,
        "o3": 240,
        "o4": 0
      }
    }
  ],
  "limitations": [
    "Results are rounded for display; the underlying calculation keeps full precision.",
    "Very large or very small inputs may hit floating-point limits in the browser.",
    "Inputs outside the accepted range are clamped rather than rejected."
  ],
  "faq": [
    {
      "q": "Why is the implied probability so low?",
      "a": "Probabilities multiply. Four coin-flip legs is a 6% ticket even though each leg feels close to even money."
    },
    {
      "q": "Does this account for the book's vig?",
      "a": "It uses the posted odds, which already include the margin. The implied probability shown is therefore slightly above the true fair probability."
    }
  ],
  "related": [],
  "license": "CC-BY-4.0",
  "citation": "RevenueLab — Parlay Odds & Payout Calculator (https://www.revenuelab.fyi/toolbox/parlay-odds)"
}