{
  "id": "gestation-calculator",
  "version": "1.0.0",
  "name": "Gestation Calculator",
  "shortName": "Gestation",
  "description": "Estimate an animal due date or breeding date from a typical gestation period.",
  "category": "Health & Fitness",
  "categorySlug": "health-fitness",
  "keywords": [
    "gestation",
    "calculator",
    "gestation calculator"
  ],
  "status": "live",
  "workStatus": "pending",
  "reviewStatus": "pending",
  "migrationStatus": "new",
  "engine": "native",
  "creator": null,
  "reviewer": null,
  "quality": {
    "availability": "live",
    "technicalReviewRecord": "/reviews/gestation-calculator.json",
    "qualifiedReview": "pending",
    "qualifiedReviewer": null,
    "qualifiedReviewDate": null,
    "formulaVersion": "1.0.0",
    "referenceCoverage": "references-pending",
    "releaseTestScope": "Catalog and regression checks are not a professional formula audit; consult release evidence.",
    "historicalMetadataDate": "2026-09-01",
    "historicalMetadataNotice": "The imported date is not evidence of a completed human review."
  },
  "notice": "This educational estimate does not replace veterinary care. Gestation varies by animal, breed, litter, and health.",
  "urls": {
    "page": "/calculator/gestation-calculator/",
    "definition": "/calculator/gestation-calculator/definition.json",
    "schema": "/calculator/gestation-calculator/schema.json",
    "llms": "/calculator/gestation-calculator/llms.txt",
    "legacyDefinition": "/calculator/gestation-calculator.json"
  },
  "queryExample": "https://askcalculators.com/calculator/gestation-calculator/?animal=cow&mode=due&date=2026-09-01&customDays=150",
  "queryParameters": {
    "animal": {
      "label": "Animal",
      "type": "select",
      "required": true,
      "default": "cow"
    },
    "mode": {
      "label": "Calculate",
      "type": "select",
      "required": true,
      "default": "due"
    },
    "date": {
      "label": "Known date",
      "type": "date",
      "required": true,
      "default": "2026-09-01"
    },
    "customDays": {
      "label": "Custom gestation period (days)",
      "type": "number",
      "required": true,
      "default": 150
    }
  },
  "inputs": [
    {
      "id": "animal",
      "label": "Animal",
      "type": "select",
      "required": true,
      "defaultValue": "cow",
      "options": [
        {
          "label": "Cow / cattle",
          "value": "cow"
        },
        {
          "label": "Pig / swine",
          "value": "pig"
        },
        {
          "label": "Sheep",
          "value": "sheep"
        },
        {
          "label": "Goat",
          "value": "goat"
        },
        {
          "label": "Horse",
          "value": "horse"
        },
        {
          "label": "Chicken",
          "value": "chicken"
        },
        {
          "label": "Quail",
          "value": "quail"
        },
        {
          "label": "Dog",
          "value": "dog"
        },
        {
          "label": "Cat",
          "value": "cat"
        },
        {
          "label": "Rabbit",
          "value": "rabbit"
        },
        {
          "label": "Guinea pig",
          "value": "guineaPig"
        },
        {
          "label": "Hamster",
          "value": "hamster"
        },
        {
          "label": "Ferret",
          "value": "ferret"
        },
        {
          "label": "Elephant",
          "value": "elephant"
        },
        {
          "label": "Custom",
          "value": "custom"
        }
      ]
    },
    {
      "id": "mode",
      "label": "Calculate",
      "type": "select",
      "required": true,
      "defaultValue": "due",
      "options": [
        {
          "label": "Due date from breeding date",
          "value": "due"
        },
        {
          "label": "Breeding date from due date",
          "value": "breeding"
        }
      ]
    },
    {
      "id": "date",
      "label": "Known date",
      "type": "date",
      "required": true,
      "defaultValue": "2026-09-01"
    },
    {
      "id": "customDays",
      "label": "Custom gestation period (days)",
      "type": "number",
      "required": true,
      "defaultValue": 150,
      "min": 1,
      "max": 1000,
      "step": 1
    }
  ],
  "outputs": [
    {
      "id": "resultDate",
      "label": "Estimated date",
      "format": "date",
      "primary": true
    },
    {
      "id": "gestationDays",
      "label": "Gestation period",
      "format": "integer",
      "suffix": " days"
    },
    {
      "id": "gestationWeeks",
      "label": "Approximate weeks",
      "format": "number",
      "digits": 2
    }
  ],
  "formula": {
    "expression": "due date = breeding date + gestation days; breeding date = due date − gestation days"
  },
  "examples": [
    {
      "label": "Reproducible default-input example (not a personal recommendation)",
      "inputs": {
        "animal": "cow",
        "mode": "due",
        "date": "2026-09-01",
        "customDays": 150
      }
    }
  ],
  "sources": []
}