Calculate your due date from an IVF transfer
Work out an estimated due date from your IVF transfer date and Day 3 / Day 5 / Day 6 age, with the days-to-add shown so you can explain the math. Estimate only — not medical advice.
Enter a transfer date to see an estimate.
What this page does
If you searched the exact phrase people type after transfer — "calculate due date from IVF" — you probably have a discharge sheet with a transfer date and a foggy memory of whether they said Day 5 or Day 3. That fog is normal. Transfer day is busy; the embryology labels blur.
This page is the how-to version of the IVF hub: enter transfer date plus embryo age, see the days added, see the estimated due date. Same arithmetic as the main IVF due date calculator, framed for the "from IVF" question so you are not hunting for a toggle buried under FET marketing copy.
The intermediate number matters. When you can say "we add 261 because it was a Day 5," leave forms and partner questions get easier. When you only have a final EDD with no trail, every app disagreement feels like a conspiracy.
As always: ultrasound and clinic policy can still move the official date. This is browser-only planning math so you can show your work.
When to use
You are filling a baby registry, work leave form, or travel plan and only have transfer day. You want to show a partner why the offset is +261, not +280. You are double-checking a nurse's verbal math before beta.
It also helps when two apps disagree because one forced an LMP field and the other used transfer dating. If someone in the group chat insists "IVF is just plus 280 from a fake period," this page is the calm counterexample with the days-to-add line visible.
When not to
If you already live in FET-land and only care about frozen transfers, the FET due date page is tighter. If your only reliable number is an ultrasound EDD, reverse from that instead of inventing a transfer date you do not have.
Do not use this to second-guess a dating scan your doctor has already finalized. Do not date from retrieval alone when the paperwork clearly lists a later transfer day.
Assumptions
Same day-age offsets as the IVF hub: Day 3 → +263, Day 5 → +261, Day 6 → +260 (266 minus embryo age).
One transfer date, one embryo age. We do not model assisted-hatching label quirks, split transfers on different days, dual-embryo age conflicts, or clinic-specific adjusted calendars. If two ages were discussed, ask which one your clinic used for dating — the tool cannot guess.
Examples
January 20, 2026 · Day 5 → EDD October 8, 2026. +261 from transfer (266 − 5).
January 20, 2026 · Day 3 → EDD October 10, 2026. +263 — two days later than the Day 5 case on the same transfer date.
April 4, 2026 · Day 6 → EDD December 20, 2026. +260 for a Day 6 blastocyst.
Gotchas
Retrieval day is not transfer day; mixing them is the most common DIY mistake.
Natural-cycle vs medicated FET changes medications and monitoring, not the basic day-age add-on.
If two embryo ages were discussed ("it was Day 5 but started as Day 3"), ask which age your clinic used for dating.
Beta day confirms pregnancy hormones; it does not automatically rewrite transfer-based dating.
"Plus 280" shortcuts only work after you have a correct LMP-equivalent — they are not a substitute for transfer math.
Copying a friend's Day 5 offset onto your Day 3 transfer quietly shifts the EDD by two days.
How this is calculated
Think of it as showing your work: the intermediate "days to add" matters as much as the final EDD when you are explaining the date to someone else.
Start from paperwork, not from a forum default. Day 5 is common, not universal. If the sheet says Day 3 or Day 6, use that label even if half the internet assumes blastocyst.
- Confirm whether the embryo was Day 3, Day 5, or Day 6 at transfer (ask the clinic if the paperwork is ambiguous).
- Enter the transfer date, not the retrieval date, unless they truly match.
- Note the days-to-add figure (for example, 261 for Day 5) and the resulting EDD.
- Compare with the portal date; if they differ after a scan, the scan usually wins.
- For hospital forms that demand LMP, switch to the IVF LMP-equivalent tool.
- Save or screenshot the offset if you need to explain it later — the "why" fades faster than the date.
days to add = 266 − embryo age EDD = transfer date + days to add
Related calculators
The IVF due date hub is the broader landing page with FET and multi-age framing in one place. Day 3 and Day 5 pages lock the age selector for people who searched those exact phrases.
If your question is really "what fake LMP do I type into this hospital form," jump to the LMP-equivalent tool after you have an EDD. If you only have an EDD already, reverse dating is cleaner than inventing a transfer.
See also: ivf due date calculator, day 3 embryo transfer due date, day 5 blastocyst transfer due date, and fet due date calculator.
FAQ
- What do I need to calculate a due date from IVF?
- A transfer date and the embryo's day age at transfer (usually 3, 5, or 6). That is enough for a planning estimate. Retrieval date alone is not a substitute unless your clinic dated you that way for a specific reason they explained.
- Why is Day 5 plus 261 days?
- About 266 days from fertilization minus the five days the embryo already lived before transfer. Day 3 subtracts three days instead, so you add 263. Day 6 subtracts six, so you add 260.
- Can I use my last period instead?
- Only if you build a correct IVF LMP-equivalent. A real period you did not have will throw period apps off by a week or more. Many IVF charts never needed a true LMP in the first place.
- Will my beta bloodwork change the due date?
- Beta confirms pregnancy. Dating usually still follows transfer math or a later ultrasound rule your clinic uses. The blood-draw day is not a new fertilization date.
- Is this the same as the IVF due date calculator?
- Same engine, different search framing. Use whichever page matches how you asked the question; the offsets are aligned so you are not choosing between competing formulas.
- What if the paperwork says blastocyst but not Day 5 or Day 6?
- Ask the clinic which day-age label they used for dating. Blastocyst usually means Day 5 or Day 6, and that one-day difference matters for the add-on.
- Why show "days to add" at all?
- Because that is the number people misremember. Seeing 261 next to Day 5 makes the two-day gap versus Day 3 obvious without a spreadsheet.
- Is this medical advice?
- No — estimate only. Confirm with your clinic before medical or leave decisions.