{
  "slug": "inflation-adjusted-return",
  "title": "Inflation Adjusted Return Calculator",
  "heading": "Real (Inflation-Adjusted) Return Calculator",
  "category": "financial",
  "url": "https://www.revenuelab.fyi/toolbox/inflation-adjusted-return",
  "summary": "What your investment return is worth after inflation.",
  "description": "A 7% nominal return with 3% inflation is not 4% — it is 3.88%, because the relationship is multiplicative. Over decades that gap compounds into real money.",
  "formula": "Real return = ((1 + nominal) ÷ (1 + inflation) − 1) × 100.",
  "dateModified": "2026-09-30",
  "run_url": "https://www.revenuelab.fyi/api/public/calc?tool=inflation-adjusted-return",
  "inputs": [
    {
      "id": "amount",
      "label": "Amount invested",
      "kind": "number",
      "hint": null,
      "default": 100000,
      "unit": "$",
      "min": 0,
      "max": null
    },
    {
      "id": "nominal",
      "label": "Nominal annual return",
      "kind": "number",
      "hint": null,
      "default": 8,
      "unit": "%",
      "min": -20,
      "max": 40
    },
    {
      "id": "inflation",
      "label": "Annual inflation",
      "kind": "number",
      "hint": null,
      "default": 3,
      "unit": "%",
      "min": 0,
      "max": 20
    },
    {
      "id": "years",
      "label": "Years",
      "kind": "number",
      "hint": null,
      "default": 20,
      "unit": null,
      "min": 1,
      "max": 60
    },
    {
      "id": "tax",
      "label": "Tax drag on returns",
      "kind": "number",
      "hint": null,
      "default": 0,
      "unit": "%",
      "min": 0,
      "max": 50
    }
  ],
  "outputs": [
    {
      "id": "real",
      "label": "Real annual return",
      "format": "percent",
      "hint": null,
      "primary": true
    },
    {
      "id": "realValue",
      "label": "Value in today's dollars",
      "format": "currency",
      "hint": null,
      "primary": false
    },
    {
      "id": "nominalValue",
      "label": "Nominal value",
      "format": "currency",
      "hint": null,
      "primary": false
    },
    {
      "id": "lost",
      "label": "Purchasing power lost to inflation",
      "format": "currency",
      "hint": null,
      "primary": false
    },
    {
      "id": "purchasingPower",
      "label": "Share of nominal value retained",
      "format": "percent",
      "hint": null,
      "primary": false
    },
    {
      "id": "doubling",
      "label": "Years to double in real terms",
      "format": "decimal",
      "hint": null,
      "primary": false
    }
  ],
  "worked_example": {
    "inputs": [
      "Amount invested: 100000 $",
      "Nominal annual return: 8 %",
      "Annual inflation: 3 %",
      "Years: 20",
      "Tax drag on returns: 0 %"
    ],
    "outputs": [
      "Real annual return: 4.854%",
      "Value in today's dollars: $258,065.90",
      "Nominal value: $466,095.71",
      "Purchasing power lost to inflation: $208,029.82",
      "Share of nominal value retained: 55.4%",
      "Years to double in real terms: 14.8"
    ]
  },
  "how_to": {
    "title": "How to use this",
    "steps": [
      "Enter amount invested ($).",
      "Enter nominal annual return (%).",
      "Enter annual inflation (%).",
      "Enter years.",
      "Enter tax drag on returns (%).",
      "Read your real annual return 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": {
        "amount": 60000,
        "nominal": 4.8,
        "inflation": 1.7999999999999998,
        "years": 12,
        "tax": 0
      }
    },
    {
      "name": "Typical",
      "description": "Defaults — the most common real-world setup.",
      "values": {
        "amount": 100000,
        "nominal": 8,
        "inflation": 3,
        "years": 20,
        "tax": 0
      }
    },
    {
      "name": "Ambitious",
      "description": "Higher-end numbers — what if things really pop?",
      "values": {
        "amount": 160000,
        "nominal": 12.8,
        "inflation": 4.800000000000001,
        "years": 32,
        "tax": 0
      }
    }
  ],
  "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 real (inflation-adjusted) return calculator work?",
      "a": "A 7% nominal return with 3% inflation is not 4% — it is 3.88%, because the relationship is multiplicative. Over decades that gap compounds into real money. The underlying maths is: Real return = ((1 + nominal) ÷ (1 + inflation) − 1) × 100."
    },
    {
      "q": "What do I need to enter?",
      "a": "5 values: amount invested, nominal annual return, annual inflation, years, and tax drag on returns. 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 real annual return result mean?",
      "a": "It is returned as a percentage 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/stock-return",
    "https://www.revenuelab.fyi/toolbox/safe-withdrawal-rate"
  ],
  "license": "CC-BY-4.0",
  "citation": "RevenueLab — Inflation Adjusted Return Calculator (https://www.revenuelab.fyi/toolbox/inflation-adjusted-return)"
}