IVF gestational age calculator
After IVF, “how many weeks?” should not require inventing a period. Start from transfer + day age (or an EDD) and read weeks + days. Estimate only — not medical advice.
Enter a date to see an estimate.
What this page does
Prefers the IVF transfer anchor: build EDD from day age, then GA from that EDD as of today (or a custom as-of). Also supports LMP-equivalent / EDD anchors when that is what you have on paper.
Same GA engine as the main gestational-age page — framed for IVF searchers.
When to use
Post-transfer week counting; portal vs napkin disagreement; forms that ask “weeks pregnant” after IVF.
When not to
Override CRL dating. No transfer date and no EDD.
Assumptions
Browser-only planning arithmetic. Defaults are disclosed on the page. Ultrasound and clinic policy override this tool.
Examples
Day 5 transfer Mar 10, 2026 · as-of Jul 17, 2026 → GA weeks + days from derived EDD.
Known IVF EDD Nov 26, 2026 · as-of Jul 17, 2026 → 21 weeks 1 day style result.
Gotchas
Clinic dating after ultrasound can differ from browser math — the clinic wins for medical decisions.
Wrong input dates (retrieval vs transfer, spotting vs true LMP) slide every result.
Estimate only — not medical advice.
How this is calculated
The math stays in your browser. Enter the dates you actually know, read the estimate, and treat clinic ultrasound dating as the authority when it disagrees.
Nothing here is medical advice, a diagnosis, or a substitute for prenatal care.
- Enter the date(s) or numbers this page asks for.
- Check the assumptions under the result and on Methodology.
- Compare with your clinic portal if you have one.
- Use related tools if you only have a different kind of date.
- Confirm medical decisions with your clinician.
EDD from transfer +(266−age), then GA days = 280 − (EDD − asOf).
Related calculators
General GA: gestational age calculator. Transfer → EDD: IVF due date. Fake period field: LMP-equivalent.
See also: gestational age calculator, ivf due date calculator, and ivf lmp equivalent calculator.
FAQ
- How do you get weeks after IVF?
- Date from transfer + embryo age (or clinic EDD), then convert to weeks + days.
- Do I need a real LMP?
- No — transfer mode avoids inventing one.
- FET weeks?
- Same day-age idea from the FET date.
- Why does my period app disagree?
- It probably forced a fake LMP.
- Ultrasound redating?
- Clinic policy wins.
- Is this medical advice?
- Estimate only — not medical advice. Confirm dating, testing, and medical decisions with your clinic.