How do I calculate the pregnancy term after IVF?

Enter the embryo transfer date and its age (3 or 5 days). The calculator takes conception as the transfer date minus the embryo age and computes the gestational age week by week and the estimated due date.

What is the difference between a day-3 and day-5 transfer?

A day-5 embryo (blastocyst) is 2 days “older” than a day-3 one, so for the same transfer date the term is 2 days more and the due date 2 days earlier. Choose the right option.

How accurate is the due date after IVF?

After IVF the conception date is known exactly, so the EDD is more precise than in natural pregnancy. It is still an estimate: birth at 37–42 weeks is on-time. The term is refined by ultrasound.

From what date is gestational age counted?

From a “notional last period” — about 2 weeks before conception. The calculator makes this adjustment itself from the transfer date and embryo age.

Will it match the ultrasound?

Usually yes, within a few days. If the discrepancy is large, the doctor relies on the first-trimester ultrasound as the most reliable dating.

IVF pregnancy calculator (by transfer date)

After IVF the term is more precise than in natural pregnancy: the transfer date and embryo age are known. Enter the transfer date and choose whether the embryo was a day-3 or a day-5 (blastocyst) one — the calculator gives the gestational age week by week and the estimated due date.

Estimate term and due date after IVF

Enter the transfer date and embryo age — the term appears instantly.

How the term is calculated after IVF

In natural pregnancy the conception date is approximate, but after IVF it is exact: it is the fertilization day, i.e. the transfer date minus the embryo age (3 or 5 days). Term and due date are counted from it, so the IVF estimate is usually more precise.

Gestational age is conventionally counted as if conception happened 2 weeks after a “notional last period” — the calculator makes this adjustment automatically.

Day-3 vs day-5 transfer

An embryo is transferred either on day 3 (cleavage stage) or day 5 (blastocyst). The 2-day age difference means that for the same transfer date the term and due date differ by those 2 days.

Pick the correct option in the calculator — it affects accuracy.

The due date is an estimate

The estimated due date (EDD) is a guide: most babies are born within ±1–2 weeks of it, but the exact date depends on many factors. Birth at 37–42 weeks is considered on-time.

Your doctor refines the term by ultrasound, especially first-trimester, which remains the dating gold standard.

A guide, not a diagnosis

The calculator helps you understand the term and plan follow-up. It does not replace a doctor and ultrasound; with any worrying symptoms, contact your ob-gyn.

Frequently asked questions

Enter the embryo transfer date and its age (3 or 5 days). The calculator takes conception as the transfer date minus the embryo age and computes the gestational age week by week and the estimated due date.
A day-5 embryo (blastocyst) is 2 days “older” than a day-3 one, so for the same transfer date the term is 2 days more and the due date 2 days earlier. Choose the right option.
After IVF the conception date is known exactly, so the EDD is more precise than in natural pregnancy. It is still an estimate: birth at 37–42 weeks is on-time. The term is refined by ultrasound.
From a “notional last period” — about 2 weeks before conception. The calculator makes this adjustment itself from the transfer date and embryo age.
Usually yes, within a few days. If the discrepancy is large, the doctor relies on the first-trimester ultrasound as the most reliable dating.

hCG and tests after transfer — decode them together

Upload your report — AI reads hCG, progesterone and other values, links them to the term and suggests what to do.

Decode my lab results

This calculator is for reference and information only and is not a diagnosis. The term and course of pregnancy are refined by a doctor via ultrasound.