{
  "id": "half-life-calculator",
  "version": "7.0.0",
  "name": "Half-Life Calculator",
  "shortName": "Half-Life",
  "description": "Calculate radioactive decay, half-life, or remaining quantity.",
  "category": "Math & Statistics",
  "categorySlug": "math-statistics",
  "keywords": [
    "half",
    "life"
  ],
  "status": "live",
  "workStatus": "pending",
  "reviewStatus": "pending",
  "migrationStatus": "migrated",
  "migratedDate": "2026-08-18",
  "engine": "legacy-react",
  "creator": null,
  "reviewer": null,
  "quality": {
    "availability": "live",
    "technicalReviewRecord": "/reviews/half-life-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/half-life-calculator/",
    "definition": "/calculator/half-life-calculator/definition.json",
    "schema": "/calculator/half-life-calculator/schema.json",
    "llms": "/calculator/half-life-calculator/llms.txt",
    "legacyDefinition": "/calculator/half-life-calculator.json"
  },
  "queryExample": "https://askcalculators.com/calculator/half-life-calculator/?initial=100&time=10&remaining=50&mode=find-remaining",
  "queryParameters": {
    "initial": {
      "label": "Initial Quantity (N₀)",
      "type": "number",
      "required": false,
      "default": 100
    },
    "halfLife": {
      "label": "Half-Life (t½)",
      "type": "number",
      "required": false,
      "default": ""
    },
    "time": {
      "label": "Elapsed Time (t)",
      "type": "number",
      "required": false,
      "default": 10
    },
    "remaining": {
      "label": "Remaining Quantity (Nₜ)",
      "type": "number",
      "required": false,
      "default": 50
    },
    "mode": {
      "label": "Mode",
      "type": "select",
      "required": false,
      "default": "find-remaining"
    }
  },
  "inputs": [
    {
      "id": "initial",
      "label": "Initial Quantity (N₀)",
      "type": "number",
      "defaultValue": 100
    },
    {
      "id": "halfLife",
      "label": "Half-Life (t½)",
      "type": "number",
      "defaultValue": ""
    },
    {
      "id": "time",
      "label": "Elapsed Time (t)",
      "type": "number",
      "defaultValue": 10
    },
    {
      "id": "remaining",
      "label": "Remaining Quantity (Nₜ)",
      "type": "number",
      "defaultValue": 50
    },
    {
      "id": "mode",
      "label": "Mode",
      "type": "select",
      "defaultValue": "find-remaining"
    }
  ],
  "outputs": [
    {
      "id": "result",
      "label": "Result",
      "format": "text",
      "primary": true
    }
  ],
  "formula": {
    "expression": "Remaining amount = initial amount × (1/2)^(elapsed time ÷ half-life)."
  },
  "examples": [
    {
      "label": "Reproducible default-input example (not a personal recommendation)",
      "inputs": {
        "initial": 100,
        "halfLife": "",
        "time": 10,
        "remaining": 50,
        "mode": "find-remaining"
      }
    }
  ],
  "sources": []
}