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IVF Beta hCG & Due Date Calculator

Calculate pregnancy progression for IVF patients using Transfer Date (3-Day or 5-Day). Accounts for exact embryo age for precision dating.

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About

In Vitro Fertilization (IVF) pregnancies require different dating logic than natural conception. In a natural cycle, the date is calculated from the Last Menstrual Period (LMP), assuming ovulation occurs exactly on Day 14. In IVF, the exact moment of fertilization and the age of the embryo (Day 3 vs Day 5 blastocyst) are known constants. Using LMP can result in due dates that are off by several days. This calculator adjusts the gestational age by adding the specific biological age of the embryo to the time elapsed since transfer.

IVF fet frozen transfer due date beta test

Formulas

Gestational Age GA is calculated by normalizing the embryo age to the standard 280-day cycle.

GAdays = (Today − TransferDate) + 14 + EmbryoAge

Due Date is projected by adding 266 days (38 weeks) to the calculated fertilization day.

Reference Data

Embryo TypeEffective "Ovulation"Base Calculation
Day 3 TransferTransfer Date − 3 daysDays Post Transfer + 2w3d
Day 5 TransferTransfer Date − 5 daysDays Post Transfer + 2w5d

Frequently Asked Questions

Clinics typically schedule the first Beta blood test 9 to 14 days after transfer (9dp5dt or 11dp3dt). Testing earlier with home urine kits can lead to false positives if the "trigger shot" (hCG injection) has not fully cleared from your system.
Yes. Whether the cycle was fresh or frozen, the biological age of the embryo at the moment of transfer remains the critical variable. The calculator treats FET and Fresh cycles identically regarding dating.