Pink Mom MathIVF Transfer Due Date Calculator
Calculate your estimated due date, LMP equivalent, and current gestational age from your embryo transfer date.
How IVF Due Dates Are Calculated
Unlike natural pregnancies where gestational age is estimated from the last menstrual period (LMP), IVF pregnancies have a known fertilization date — the day eggs were retrieved and fertilized in the laboratory.
The formula used is: EDD = Transfer Date + (266 − Embryo Age in Days). A full-term pregnancy is 266 days from fertilization (or 280 days from LMP in a natural 28-day cycle). Since the embryo is already a known number of days old at transfer, that number is subtracted from 266 to get the remaining days.
Embryo Age at Transfer
- Day 3 (Cleavage stage): 266 − 3 = 263 days added to transfer date
- Day 5 (Blastocyst): 266 − 5 = 261 days added to transfer date
- Day 6 (Expanded blastocyst): 266 − 6 = 260 days added to transfer date
Frequently Asked Questions
Related Calculators
Due Date Calculator
Calculate your estimated due date from LMP, conception date, IVF transfer, or ultrasound. Supports twins.
Pregnancy Week Calculator
Find out exactly how far along you are in weeks and days with trimester milestone markers.
Fertility Age Calculator
Understand how age affects monthly conception probability with evidence-based statistics.
Ovulation Calculator
Calculate your ovulation day and fertile window based on your cycle. Supports irregular cycles and PCOS mode.
Trimester Calculator
See your trimester stages with exact date ranges and key developmental milestones.
This calculator provides estimates for educational purposes only. It is not a substitute for professional medical advice, diagnosis, or treatment. Always consult your healthcare provider with questions about your health or your baby's health.
Formula based on ASRM guidelines: EDD = Transfer Date + (266 − Embryo Age Days)