{
  "id": "pregnancy-calculator",
  "version": "2.0.0",
  "name": "Pregnancy Calculator",
  "shortName": "Pregnancy",
  "description": "Estimate due date, conception date, gestational age, trimester, term window, and pregnancy milestones from five dating methods.",
  "category": "Health & Fitness",
  "categorySlug": "health-fitness",
  "keywords": [
    "pregnancy timeline",
    "gestational age",
    "due date",
    "trimester",
    "IVF due date",
    "ultrasound dating"
  ],
  "status": "live",
  "workStatus": "pending",
  "reviewStatus": "pending",
  "migrationStatus": "migrated",
  "migratedDate": "2026-08-25",
  "engine": "native",
  "creator": null,
  "reviewer": null,
  "quality": {
    "availability": "live",
    "technicalReviewRecord": "/reviews/pregnancy-calculator.json",
    "qualifiedReview": "pending",
    "qualifiedReviewer": null,
    "qualifiedReviewDate": null,
    "formulaVersion": "2.0.0",
    "referenceCoverage": "references-listed",
    "releaseTestScope": "Catalog and regression checks are not a professional formula audit; consult release evidence.",
    "historicalMetadataDate": "2026-08-25",
    "historicalMetadataNotice": "The imported date is not evidence of a completed human review."
  },
  "notice": "Pregnancy dates are estimates. Ultrasound interpretation and clinical dating should be confirmed by an obstetric professional.",
  "urls": {
    "page": "/calculator/pregnancy-calculator/",
    "definition": "/calculator/pregnancy-calculator/definition.json",
    "schema": "/calculator/pregnancy-calculator/schema.json",
    "llms": "/calculator/pregnancy-calculator/llms.txt",
    "legacyDefinition": "/calculator/pregnancy-calculator.json"
  },
  "queryExample": "https://askcalculators.com/calculator/pregnancy-calculator/?method=lmp&lmpDate=2026-06-01&cycleLength=28",
  "queryParameters": {
    "method": {
      "label": "Dating method",
      "type": "select",
      "required": true,
      "default": "lmp"
    },
    "dueDate": {
      "label": "Known due date",
      "type": "date",
      "required": true,
      "default": "2027-03-08",
      "showWhen": {
        "field": "method",
        "equals": "due"
      }
    },
    "lmpDate": {
      "label": "First day of last menstrual period",
      "type": "date",
      "required": true,
      "default": "2026-06-01",
      "showWhen": {
        "field": "method",
        "equals": "lmp"
      }
    },
    "cycleLength": {
      "label": "Average cycle length",
      "type": "number",
      "required": true,
      "default": 28,
      "showWhen": {
        "field": "method",
        "equals": "lmp"
      }
    },
    "conceptionDate": {
      "label": "Known conception date",
      "type": "date",
      "required": true,
      "default": "2026-06-15",
      "showWhen": {
        "field": "method",
        "equals": "conception"
      }
    },
    "ultrasoundDate": {
      "label": "Ultrasound date",
      "type": "date",
      "required": true,
      "default": "2026-08-24",
      "showWhen": {
        "field": "method",
        "equals": "ultrasound"
      }
    },
    "ultrasoundWeeks": {
      "label": "Gestational age at ultrasound: weeks",
      "type": "number",
      "required": true,
      "default": 12,
      "showWhen": {
        "field": "method",
        "equals": "ultrasound"
      }
    },
    "ultrasoundDays": {
      "label": "Additional days",
      "type": "number",
      "required": true,
      "default": 0,
      "showWhen": {
        "field": "method",
        "equals": "ultrasound"
      }
    },
    "transferDate": {
      "label": "Embryo transfer date",
      "type": "date",
      "required": true,
      "default": "2026-06-20",
      "showWhen": {
        "field": "method",
        "equals": "ivf"
      }
    },
    "embryoAgeDays": {
      "label": "Embryo age at transfer",
      "type": "select",
      "required": true,
      "default": 5,
      "showWhen": {
        "field": "method",
        "equals": "ivf"
      }
    },
    "asOfDate": {
      "label": "Calculate pregnancy progress as of",
      "type": "date",
      "required": true
    }
  },
  "inputs": [
    {
      "id": "method",
      "label": "Dating method",
      "type": "select",
      "required": true,
      "defaultValue": "lmp",
      "options": [
        {
          "label": "Known due date",
          "value": "due"
        },
        {
          "label": "Last menstrual period",
          "value": "lmp"
        },
        {
          "label": "Conception date",
          "value": "conception"
        },
        {
          "label": "Ultrasound dating",
          "value": "ultrasound"
        },
        {
          "label": "IVF embryo transfer",
          "value": "ivf"
        }
      ],
      "width": "full"
    },
    {
      "id": "dueDate",
      "label": "Known due date",
      "type": "date",
      "required": true,
      "defaultValue": "2027-03-08",
      "showWhen": {
        "field": "method",
        "equals": "due"
      },
      "width": "full"
    },
    {
      "id": "lmpDate",
      "label": "First day of last menstrual period",
      "type": "date",
      "required": true,
      "defaultValue": "2026-06-01",
      "showWhen": {
        "field": "method",
        "equals": "lmp"
      },
      "width": "full"
    },
    {
      "id": "cycleLength",
      "label": "Average cycle length",
      "type": "number",
      "required": true,
      "defaultValue": 28,
      "min": 20,
      "max": 45,
      "step": 1,
      "suffix": "days",
      "showWhen": {
        "field": "method",
        "equals": "lmp"
      },
      "width": "full"
    },
    {
      "id": "conceptionDate",
      "label": "Known conception date",
      "type": "date",
      "required": true,
      "defaultValue": "2026-06-15",
      "showWhen": {
        "field": "method",
        "equals": "conception"
      },
      "width": "full"
    },
    {
      "id": "ultrasoundDate",
      "label": "Ultrasound date",
      "type": "date",
      "required": true,
      "defaultValue": "2026-08-24",
      "showWhen": {
        "field": "method",
        "equals": "ultrasound"
      },
      "width": "full"
    },
    {
      "id": "ultrasoundWeeks",
      "label": "Gestational age at ultrasound: weeks",
      "type": "number",
      "required": true,
      "defaultValue": 12,
      "min": 0,
      "max": 42,
      "step": 1,
      "showWhen": {
        "field": "method",
        "equals": "ultrasound"
      },
      "width": "half"
    },
    {
      "id": "ultrasoundDays",
      "label": "Additional days",
      "type": "number",
      "required": true,
      "defaultValue": 0,
      "min": 0,
      "max": 6,
      "step": 1,
      "showWhen": {
        "field": "method",
        "equals": "ultrasound"
      },
      "width": "half"
    },
    {
      "id": "transferDate",
      "label": "Embryo transfer date",
      "type": "date",
      "required": true,
      "defaultValue": "2026-06-20",
      "showWhen": {
        "field": "method",
        "equals": "ivf"
      },
      "width": "half"
    },
    {
      "id": "embryoAgeDays",
      "label": "Embryo age at transfer",
      "type": "select",
      "required": true,
      "defaultValue": 5,
      "options": [
        {
          "label": "Day 3 embryo",
          "value": 3
        },
        {
          "label": "Day 5 embryo",
          "value": 5
        },
        {
          "label": "Day 6 embryo",
          "value": 6
        }
      ],
      "showWhen": {
        "field": "method",
        "equals": "ivf"
      },
      "width": "half"
    },
    {
      "id": "asOfDate",
      "label": "Calculate pregnancy progress as of",
      "type": "date",
      "required": true,
      "defaultToday": true,
      "width": "full"
    }
  ],
  "outputs": [
    {
      "id": "dueDateResult",
      "label": "Estimated due date",
      "format": "date",
      "primary": true
    },
    {
      "id": "gestationalAge",
      "label": "Gestational age",
      "format": "text"
    },
    {
      "id": "trimester",
      "label": "Trimester",
      "format": "text"
    },
    {
      "id": "conceptionDateResult",
      "label": "Estimated conception date",
      "format": "date"
    },
    {
      "id": "lmpDateResult",
      "label": "Estimated LMP date",
      "format": "date"
    },
    {
      "id": "daysRemaining",
      "label": "Days until estimated due date",
      "format": "integer"
    },
    {
      "id": "termWindow",
      "label": "Estimated term window",
      "format": "text"
    }
  ],
  "formula": {
    "expression": "LMP due date = LMP + 280 days + cycle adjustment; conception = due − 266 days; ultrasound and IVF modes subtract measured gestational or embryo age from 266–280 days."
  },
  "examples": [
    {
      "label": "Reproducible default-input example (not a personal recommendation)",
      "inputs": {
        "method": "lmp",
        "dueDate": "2027-03-08",
        "lmpDate": "2026-06-01",
        "cycleLength": 28,
        "conceptionDate": "2026-06-15",
        "ultrasoundDate": "2026-08-24",
        "ultrasoundWeeks": 12,
        "ultrasoundDays": 0,
        "transferDate": "2026-06-20",
        "embryoAgeDays": 5
      }
    }
  ],
  "sources": [
    {
      "label": "Calculator.net reference calculator",
      "url": "https://www.calculator.net/pregnancy-calculator.html"
    },
    {
      "label": "ACOG methods for estimating due date",
      "url": "https://www.acog.org/clinical/clinical-guidance/committee-opinion/articles/2017/05/methods-for-estimating-the-due-date"
    }
  ]
}