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IVF Due Date Calculator

Estimate your IVF due date using embryo transfer date and embryo age (day 1-7). Works for fresh or frozen transfers and single or multiple pregnancies, with trimester and other milestone dates.

Calculate Your IVF Due Date

Embryo Transfer Date
Transfer Type
Embryo Age (Days)
Pregnancy Type

Your Results

Sunday, June 21, 2026
Estimated Due Date
0
Weeks Pregnant
261
Days Remaining
1
Trimester
5
Embryo Age (Days)

Key Milestones

First Trimester Ends:Jan 4, 2026
Viability (24 weeks):Mar 15, 2026
Third Trimester:Apr 12, 2026

Recommendations

  • Schedule early pregnancy ultrasound (6-8 weeks)
  • Begin prenatal vitamins with folic acid
  • Avoid alcohol, smoking, and certain medications
  • Discuss progesterone support with your doctor
  • Continue hormone replacement therapy as prescribed
  • Monitor endometrial thickness

Please consult your healthcare provider for personalized medical advice and treatment recommendations.

IVF Due Date Calculation Methods

Calculation Method

Standard IVF Calculation

Transfer Date - Embryo Age + 266 days

  • • Most accurate method
  • • Accounts for embryo development
  • • Based on commonly cited clinical practice (sources vary)
Multiples Adjustment

Earlier delivery dates for multiples

  • • Twins: -14 days
  • • Triplets: -28 days
  • • Higher order: -42 days

Embryo Development Stages

Days 1-3 (Cleavage)

Early embryo development

  • • Day 1: 2-cell embryo
  • • Day 2: 4-cell embryo
  • • Day 3: 8-cell embryo
Days 4-7 (Blastocyst)

Advanced embryo development

  • • Day 4: Morula stage
  • • Day 5: Blastocyst
  • • Day 6-7: Expanded blastocyst

How to Calculate IVF Due Date

IVF Due Date Formula

Step 1: Take your transfer date
Step 2: Subtract embryo age (days of development)
Step 3: Add 266 days (38 weeks) to get due date
Multiples: Subtract additional days for multiples

Calculation Steps:

  1. 1
    Record your transfer date
    The date when the embryo was transferred to your uterus
  2. 2
    Determine embryo age
    Days of development (1-7 days) at time of transfer
  3. 3
    Calculate adjusted date
    Subtract embryo age from transfer date
  4. 4
    Add 266 days
    Standard pregnancy length for IVF pregnancies

Important Considerations

⚠️ Medical Disclaimer

This calculator provides estimates using commonly cited clinical thresholds (sources vary). Individual pregnancy outcomes may vary. Always consult with your healthcare provider for personalized medical advice.

📊 IVF Accuracy

IVF due dates are more accurate than natural conception

  • • Known conception date
  • • Precise embryo age
  • • Controlled timing
🏥 Medical Monitoring

Regular ultrasound monitoring is essential

  • • Confirm due date
  • • Monitor fetal growth
  • • Detect complications early
👶 Multiple Pregnancies

Higher risk pregnancies require special care

  • • Earlier delivery dates
  • • Increased monitoring
  • • Specialized care needed
⚕️ Risk Factors

Be aware of potential complications

  • • Preterm delivery risk
  • • Gestational diabetes
  • • Hypertension risk

Example Cases

Case 1: Single Pregnancy with 5-Day Blastocyst

Transfer Date: January 15, 2024
Embryo Age: 5 days (blastocyst)
Transfer Type: Frozen
Adjusted Date: January 10, 2024
Due Date: October 2, 2024
Pregnancy Length: 266 days

Calculation: Jan 15 - 5 days = Jan 10, then + 266 days = Oct 2, 2024

Case 2: Twin Pregnancy with 3-Day Embryo

Transfer Date: March 1, 2024
Embryo Age: 3 days (8-cell)
Pregnancy Type: Twins
Adjusted Date: February 27, 2024
Due Date: November 18, 2024
Adjustment: -14 days for twins

Calculation: Mar 1 - 3 days = Feb 27, then + 266 days - 14 days (twins) = Nov 18, 2024

Frequently Asked Questions

What is IVF due date calculation and how does it work?
IVF due date calculation determines your estimated delivery date based on your embryo transfer date and embryo age. Unlike natural conception, IVF pregnancies have a known conception date, making calculations more accurate. The calculation adds 266 days (38 weeks) from the adjusted transfer date, accounting for embryo development stage.
How is the IVF due date calculated?
The calculation: 1) Take your transfer date, 2) Subtract the embryo age (days of development), 3) Add 266 days (38 weeks) to get the due date. For example: 5-day blastocyst transferred on Jan 1st → adjusted date = Dec 27th → due date = Sep 19th. Multiples are adjusted earlier (twins: -14 days, triplets: -28 days).
What's the difference between fresh and frozen embryo transfers?
Fresh transfers use embryos created and transferred in the same cycle, while frozen transfers use previously cryopreserved embryos. Both use the same due date calculation method. Fresh transfers may have higher OHSS risk, while frozen transfers often have better outcomes due to more controlled timing and endometrial preparation.
Why is embryo age important for due date calculation?
Embryo age represents days of development (1-7 days). A 5-day blastocyst is more developed than a 3-day embryo, so the calculation accounts for this developmental stage. This ensures the due date reflects the actual gestational age from conception, not just from transfer date.
How accurate are IVF due date calculations?
IVF due dates are generally more accurate than natural conception dates because the conception date is known precisely. However, individual variations in pregnancy length still occur. Most IVF pregnancies deliver within 2 weeks of the calculated due date. Regular ultrasounds help confirm and adjust the due date as needed.

Related Calculators

IVF Due Date Calculator - EDD by Transfer Date & Embryo Age