{
  "id": "permutation-calculator",
  "version": "7.0.0",
  "name": "Permutation Calculator",
  "shortName": "Permutation",
  "description": "Calculate Permutations (nPr) and Combinations (nCr).",
  "category": "Math & Statistics",
  "categorySlug": "math-statistics",
  "keywords": [
    "permutation",
    "combination",
    "permutation and combination",
    "npr",
    "ncr"
  ],
  "status": "live",
  "workStatus": "pending",
  "reviewStatus": "pending",
  "migrationStatus": "migrated",
  "migratedDate": "2026-08-18",
  "engine": "legacy-react",
  "creator": null,
  "reviewer": null,
  "quality": {
    "availability": "live",
    "technicalReviewRecord": "/reviews/permutation-calculator.json",
    "qualifiedReview": "pending",
    "qualifiedReviewer": null,
    "qualifiedReviewDate": null,
    "formulaVersion": "7.0.0",
    "referenceCoverage": "references-pending",
    "releaseTestScope": "Catalog and regression checks are not a professional formula audit; consult release evidence.",
    "historicalMetadataDate": "2026-08-18",
    "historicalMetadataNotice": "The imported date is not evidence of a completed human review."
  },
  "urls": {
    "page": "/calculator/permutation-calculator/",
    "definition": "/calculator/permutation-calculator/definition.json",
    "schema": "/calculator/permutation-calculator/schema.json",
    "llms": "/calculator/permutation-calculator/llms.txt",
    "legacyDefinition": "/calculator/permutation-calculator.json"
  },
  "queryExample": "https://askcalculators.com/calculator/permutation-calculator/?n=10&r=3",
  "queryParameters": {
    "n": {
      "label": "Total Items (n)",
      "type": "number",
      "required": false,
      "default": 10
    },
    "r": {
      "label": "Items to Choose (r)",
      "type": "number",
      "required": false,
      "default": 3
    }
  },
  "inputs": [
    {
      "id": "n",
      "label": "Total Items (n)",
      "type": "number",
      "defaultValue": 10
    },
    {
      "id": "r",
      "label": "Items to Choose (r)",
      "type": "number",
      "defaultValue": 3
    }
  ],
  "outputs": [
    {
      "id": "result",
      "label": "Result",
      "format": "text",
      "primary": true
    }
  ],
  "formula": {
    "expression": "Permutations nPr = n! ÷ (n−r)!; combinations nCr = n! ÷ [r!(n−r)!]."
  },
  "examples": [
    {
      "label": "Reproducible default-input example (not a personal recommendation)",
      "inputs": {
        "n": 10,
        "r": 3
      }
    }
  ],
  "sources": []
}