{
  "slug": "lego-set-roi",
  "title": "LEGO Set Investment ROI Calculator",
  "heading": "LEGO Set Investment ROI Calculator",
  "category": "financial",
  "url": "https://www.revenuelab.fyi/toolbox/lego-set-roi",
  "summary": "Return on holding a retired LEGO set sealed.",
  "description": "Retired sets appreciate, but storage space and marketplace fees eat into it. See annualized return after all of that.",
  "formula": null,
  "dateModified": "2026-09-30",
  "run_url": "https://www.revenuelab.fyi/api/public/calc?tool=lego-set-roi",
  "inputs": [
    {
      "id": "cost",
      "label": "Purchase price",
      "kind": "number",
      "hint": null,
      "default": 160,
      "unit": "$",
      "min": null,
      "max": null
    },
    {
      "id": "discount",
      "label": "Discount at purchase",
      "kind": "number",
      "hint": null,
      "default": 20,
      "unit": "%",
      "min": 0,
      "max": 60
    },
    {
      "id": "years",
      "label": "Years held",
      "kind": "number",
      "hint": null,
      "default": 4,
      "unit": null,
      "min": 1,
      "max": null
    },
    {
      "id": "growth",
      "label": "Annual appreciation",
      "kind": "number",
      "hint": null,
      "default": 11,
      "unit": "%",
      "min": null,
      "max": null
    },
    {
      "id": "fees",
      "label": "Sale fees + shipping",
      "kind": "number",
      "hint": null,
      "default": 18,
      "unit": "%",
      "min": null,
      "max": null
    }
  ],
  "outputs": [
    {
      "id": "profit",
      "label": "Profit per set",
      "format": "currency",
      "hint": null,
      "primary": true
    },
    {
      "id": "cagr",
      "label": "Annualized return",
      "format": "percent",
      "hint": null,
      "primary": false
    },
    {
      "id": "net",
      "label": "Net sale proceeds",
      "format": "currency",
      "hint": null,
      "primary": false
    },
    {
      "id": "paid",
      "label": "Effective cost",
      "format": "currency",
      "hint": null,
      "primary": false
    }
  ],
  "worked_example": {
    "inputs": [
      "Purchase price: 160 $",
      "Discount at purchase: 20 %",
      "Years held: 4",
      "Annual appreciation: 11 %",
      "Sale fees + shipping: 18 %"
    ],
    "outputs": [
      "Profit per set: $71.17",
      "Annualized return: 11.69%",
      "Net sale proceeds: $199.17",
      "Effective cost: $128.00"
    ]
  },
  "how_to": {
    "title": "How to use this",
    "steps": [
      "Enter purchase price ($).",
      "Enter discount at purchase (%).",
      "Enter years held.",
      "Enter annual appreciation (%).",
      "Enter sale fees + shipping (%).",
      "Read your profit per set 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": {
        "cost": 95,
        "discount": 10,
        "years": 2,
        "growth": 6.6,
        "fees": 11
      }
    },
    {
      "name": "Typical",
      "description": "Defaults — the most common real-world setup.",
      "values": {
        "cost": 160,
        "discount": 20,
        "years": 4,
        "growth": 11,
        "fees": 18
      }
    },
    {
      "name": "Ambitious",
      "description": "Higher-end numbers — what if things really pop?",
      "values": {
        "cost": 255,
        "discount": 30,
        "years": 6,
        "growth": 17.6,
        "fees": 29
      }
    }
  ],
  "limitations": [
    "Results are estimates before tax, fees, and inflation unless an input explicitly covers them.",
    "Rates are treated as fixed for the whole period — variable-rate products will drift from this projection.",
    "This is educational maths, not financial advice. Check anything contractual with the lender or your accountant."
  ],
  "faq": [
    {
      "q": "How does the lego set investment roi calculator work?",
      "a": "Retired sets appreciate, but storage space and marketplace fees eat into it. See annualized return after all of that."
    },
    {
      "q": "What do I need to enter?",
      "a": "5 values: purchase price, discount at purchase, years held, annual appreciation, and sale fees + shipping. Each field starts with a sensible default, so you can change one number at a time and watch the result move."
    },
    {
      "q": "What does the profit per set result mean?",
      "a": "It is returned as a money amount in US dollars and updates live as you edit the inputs, so you can compare two or three versions of a scenario in a few seconds."
    },
    {
      "q": "Is this calculator free, and do I need an account?",
      "a": "Yes, it's free, and no account is required. Nothing you type is stored on our servers — the maths runs entirely in your browser."
    },
    {
      "q": "How accurate is the result?",
      "a": "It applies the standard formula exactly, so the arithmetic is precise. Results are estimates before tax, fees, and inflation unless an input explicitly covers them."
    },
    {
      "q": "Who is this tool for?",
      "a": "It's built for anyone comparing money scenarios before committing — budgeting a payment, sanity-checking a quote, or seeing what a change in rate or term actually costs."
    }
  ],
  "related": [
    "https://www.revenuelab.fyi/toolbox/reseller-profit"
  ],
  "license": "CC-BY-4.0",
  "citation": "RevenueLab — LEGO Set Investment ROI Calculator (https://www.revenuelab.fyi/toolbox/lego-set-roi)"
}