{
  "id": "compound-interest-calculator",
  "version": "20.1.0",
  "name": "Compound Interest Calculator",
  "shortName": "Compound interest",
  "description": "Project investment growth with regular monthly contributions and selectable compounding.",
  "category": "Finance",
  "categorySlug": "finance",
  "keywords": [
    "investment growth",
    "compound return",
    "future value",
    "monthly contribution"
  ],
  "status": "live",
  "workStatus": "pending",
  "reviewStatus": "pending",
  "migrationStatus": "new",
  "engine": "native",
  "creator": null,
  "reviewer": null,
  "quality": {
    "availability": "live",
    "technicalReviewRecord": "/reviews/compound-interest-calculator.json",
    "qualifiedReview": "pending",
    "qualifiedReviewer": null,
    "qualifiedReviewDate": null,
    "formulaVersion": "20.1.0",
    "referenceCoverage": "references-listed",
    "releaseTestScope": "Flagship reference cases are specified in scripts/test-v20-1.mjs; consult release evidence for executed results.",
    "historicalMetadataDate": "2026-08-18",
    "historicalMetadataNotice": "The imported date is not evidence of a completed human review."
  },
  "urls": {
    "page": "/calculator/compound-interest-calculator/",
    "definition": "/calculator/compound-interest-calculator/definition.json",
    "schema": "/calculator/compound-interest-calculator/schema.json",
    "llms": "/calculator/compound-interest-calculator/llms.txt",
    "legacyDefinition": "/calculator/compound-interest-calculator.json"
  },
  "queryExample": "https://askcalculators.com/calculator/compound-interest-calculator/?initial=10000&monthly=500&annualRate=7&years=20&frequency=12",
  "queryParameters": {
    "initial": {
      "label": "Initial investment",
      "type": "money",
      "required": true,
      "default": 10000
    },
    "monthly": {
      "label": "Monthly contribution",
      "type": "money",
      "required": false,
      "default": 500
    },
    "annualRate": {
      "label": "Annual return",
      "type": "percent",
      "required": true,
      "default": 7
    },
    "years": {
      "label": "Years",
      "type": "number",
      "required": true,
      "default": 20
    },
    "frequency": {
      "label": "Compounding",
      "type": "select",
      "required": true,
      "default": 12
    }
  },
  "inputs": [
    {
      "id": "initial",
      "label": "Initial investment",
      "type": "money",
      "required": true,
      "defaultValue": 10000,
      "min": 0,
      "step": 100,
      "width": "half"
    },
    {
      "id": "monthly",
      "label": "Monthly contribution",
      "type": "money",
      "defaultValue": 500,
      "min": 0,
      "step": 10,
      "help": "Optional",
      "width": "half"
    },
    {
      "id": "annualRate",
      "label": "Annual return",
      "type": "percent",
      "required": true,
      "defaultValue": 7,
      "min": 0,
      "max": 30,
      "step": 0.1,
      "control": "slider-number",
      "width": "half"
    },
    {
      "id": "years",
      "label": "Years",
      "type": "number",
      "required": true,
      "defaultValue": 20,
      "min": 1,
      "max": 80,
      "step": 1,
      "width": "half"
    },
    {
      "id": "frequency",
      "label": "Compounding",
      "type": "select",
      "required": true,
      "defaultValue": 12,
      "options": [
        {
          "label": "Monthly",
          "value": 12
        },
        {
          "label": "Quarterly",
          "value": 4
        },
        {
          "label": "Yearly",
          "value": 1
        },
        {
          "label": "Daily",
          "value": 365
        }
      ],
      "width": "full"
    }
  ],
  "outputs": [
    {
      "id": "futureValue",
      "label": "Future value",
      "format": "currency",
      "primary": true
    },
    {
      "id": "contributions",
      "label": "Total contributions",
      "format": "currency"
    },
    {
      "id": "interestEarned",
      "label": "Growth earned",
      "format": "currency"
    },
    {
      "id": "growthPercent",
      "label": "Growth on contributions",
      "format": "percent"
    }
  ],
  "formula": {
    "expression": "FV = P(1 + r/m)ᵐᵗ + PMT × [((1 + i)ⁿ − 1) ÷ i]",
    "variables": [
      {
        "symbol": "P",
        "meaning": "initial investment"
      },
      {
        "symbol": "PMT",
        "meaning": "monthly contribution"
      },
      {
        "symbol": "r",
        "meaning": "annual rate"
      },
      {
        "symbol": "m",
        "meaning": "compounding periods per year"
      },
      {
        "symbol": "i",
        "meaning": "equivalent monthly rate"
      }
    ],
    "note": "Monthly contributions are added at the end of each month."
  },
  "examples": [
    {
      "label": "Reproducible default-input example (not a personal recommendation)",
      "inputs": {
        "initial": 10000,
        "monthly": 500,
        "annualRate": 7,
        "years": 20,
        "frequency": 12
      }
    }
  ],
  "sources": [
    {
      "label": "Investor.gov compound interest calculator",
      "url": "https://www.investor.gov/financial-tools-calculators/calculators/compound-interest-calculator"
    }
  ]
}