{
  "id": "ivf-due-date",
  "version": "f3e58b34f963",
  "status": "published",
  "name": "IVF Due Date Calculator",
  "question": "When is my IVF due date?",
  "summary": "Works out the due date of an IVF pregnancy from the embryo transfer date and the embryo’s age (day 3, 5, or 6), as ACOG recommends, and how many weeks pregnant that is on a date.",
  "category": "health",
  "subcategory": "pregnancy",
  "url": "https://www.acalculator.org/health/ivf-due-date-calculator",
  "markdown": "https://www.acalculator.org/health/ivf-due-date-calculator.md",
  "kind": "function",
  "method": "Due date = transfer date + 266 days − embryo age in days (261 days for a day-5 embryo, 263 for day 3); weeks pregnant are counted from the due date − 280 days.",
  "assumptions": [
    "Fertilization is on the egg retrieval day, so the embryo age counts days since fertilization.",
    "A pregnancy lasts 266 days from fertilization, which is 280 days from an equivalent last period two weeks earlier (ACOG).",
    "The same rule applies to fresh and frozen embryo transfers, because it uses the embryo’s age, not the calendar.",
    "Weeks pregnant show from the dated start of pregnancy to the due date. This is an estimate for information, not medical advice."
  ],
  "inputs": {
    "$schema": "https://json-schema.org/draft/2020-12/schema",
    "type": "object",
    "properties": {
      "transfer": {
        "title": "Embryo transfer date",
        "description": "The day the embryo was transferred to the uterus.",
        "type": "string",
        "format": "date"
      },
      "embryo": {
        "title": "Embryo age at transfer",
        "description": "Days from egg retrieval and fertilization to the transfer: day 3, day 5 (blastocyst), or day 6.",
        "type": "string",
        "enum": [
          "3",
          "5",
          "6"
        ]
      },
      "on": {
        "title": "How far along on",
        "description": "The date to count the weeks of pregnancy on. Today, unless you change it.",
        "type": "string",
        "format": "date"
      }
    }
  },
  "outputs": {
    "due": {
      "label": "Due date",
      "description": "The estimated due date: transfer date + 266 days − embryo age.",
      "format": "date"
    },
    "fertilization": {
      "label": "Egg retrieval and fertilization",
      "description": "The transfer date less the embryo’s age in days.",
      "format": "date"
    },
    "dated": {
      "label": "Pregnancy dated from",
      "description": "The equivalent first day of a last period: 280 days before the due date.",
      "format": "date"
    },
    "weeks": {
      "label": "Weeks pregnant",
      "description": "Weeks and days of pregnancy on the chosen date, counted from the equivalent last period.",
      "format": "duration"
    },
    "left": {
      "label": "Days until the due date",
      "description": "Days from the chosen date to the due date.",
      "format": "integer"
    }
  },
  "defaultAnswer": {
    "inputs": {
      "transfer": "2026-09-08",
      "embryo": "5",
      "on": "2026-09-29"
    },
    "outputs": {
      "due": "2027-05-27",
      "fertilization": "2026-09-03",
      "dated": "2026-08-20",
      "weeks": {
        "weeks": 5,
        "days": 5
      },
      "left": 240
    },
    "text": "With a Day 5 embryo transferred on September 8, 2026, your due date is May 27, 2027."
  },
  "examples": [
    {
      "given": {
        "transfer": "2026-09-01",
        "embryo": "5"
      },
      "expect": {
        "due": "2027-05-20",
        "fertilization": "2026-08-27",
        "dated": "2026-08-13"
      },
      "source": "ACOG Committee Opinion 700: for a day-5 embryo, the due date is 261 days from the embryo transfer date; hand calculation in content.mdx"
    },
    {
      "given": {
        "transfer": "2026-09-01",
        "embryo": "3"
      },
      "expect": {
        "due": "2027-05-22",
        "fertilization": "2026-08-29"
      },
      "source": "ACOG Committee Opinion 700: for a day-3 embryo, the due date is 263 days from the embryo transfer date"
    },
    {
      "given": {
        "transfer": "2026-09-01",
        "embryo": "6"
      },
      "expect": {
        "due": "2027-05-19"
      },
      "source": "ACOG Committee Opinion 700 (due date from the embryo age and transfer date): 266 − 6 = 260 days, the same rule as the day-3 and day-5 examples"
    },
    {
      "given": {
        "transfer": "2026-09-01",
        "embryo": "5",
        "on": "2026-09-27"
      },
      "expect": {
        "weeks": {
          "weeks": 6,
          "days": 3
        },
        "left": 235
      },
      "source": "hand calculation in content.mdx: dated from August 13, 2026 (due date − 280 days); September 27 is 45 days later, 6 weeks 3 days; 235 days to May 20, 2027"
    }
  ],
  "sources": [
    "American College of Obstetricians and Gynecologists. Committee Opinion No. 700: Methods for Estimating the Due Date. Obstetrics and Gynecology 2017;129:e150–e154. doi:10.1097/aog.0000000000002046"
  ],
  "related": [
    "conception",
    "pregnancy-test"
  ],
  "changelog": []
}