Get the date straight.
Transfer day sticky notes, EDD reverse-checks, and implantation windows — without another “empower your journey” app lecture.
Runs in your browser·No signup·Estimate only — not medical advice
Start here
Popular tools
The six dates people ask for most after transfer or a portal EDD — open one, paste the sticky note, get a planning estimate.
- IVF due dateOpen →
Day 3 / Day 5 / Day 6 / FET offsets from transfer day to an estimated due date.
- Reverse due dateOpen →
Work backward from an EDD to a conception window and LMP estimate.
- ImplantationOpen →
Likely 6–12 DPO implantation window, with the often-cited 8–10 DPO band.
- Gestational ageOpen →
Weeks + days today from LMP, due date, or IVF transfer — plus trimester hint.
- EDD workbenchOpen →
Multi-mode estimated due date: LMP, ovulation, conception, or IVF transfer.
- Next periodOpen →
Last period + cycle length — next starts without a tracker account.
Transfer day
From Day 3, Day 5, or FET — to an EDD you can explain.
Clinics date from embryo age on transfer day, not a period you never had. See the calendar add-on spelled out before you text the group chat.
Open IVF due date
Reverse from EDD
Work backward into a window — not a fake exact hour.
Have a portal due date and a blunt question? Reverse dating and conception tools answer with honest ranges you can plan around.
Try reverse due date
Two-week wait
Give the wait a shape — implantation, then test timing.
Roughly 6–12 DPO for implantation, with an 8–10 DPO band often cited. Then see when a home test is less of a coin flip — without daily panic sticks.
Open implantation windowWhy people use us
Sticky-note clarity. Browser-only math. No journey lecture.
Clinic math, open
Day 3 / Day 5 / Day 6 / FET offsets spelled out in calendar days — not buried in a discharge PDF or a forum screenshot.
Your dates, your modes
Transfer dating, weeks from LMP or EDD, reverse conception, implantation, and light cycle math — pick the question you actually have.
No signup wall
Paste the sticky-note date, get a planning estimate, leave. Math runs in your browser; dates are not the product we sell.
Browse by category
Start with the question on your sticky note — transfer dating, reverse from an EDD, or the two-week wait — then open the matching tool.
Day 3 / 5 / 6 and FET due dates, plus LMP-equivalent for hospital forms that still demand a period field.
Work backward from an EDD — conception window, not a fake exact hour for a group chat.
Rough implantation window and when a home test is less of a coin flip.
How many weeks today from LMP, EDD, or IVF transfer — plus trimester and EDD modes.
Period / luteal rough cuts for the stretch between appointments — not Flo, not a wearable.
Dating tools for sticky-note math
PregDateBase is a small set of free calculators for the dates people actually write down after IVF, FET, or a portal EDD: transfer day, embryo age, due date reverse-checks, conception windows, implantation timing, and when a home test is less of a coin flip. The tone is clinic sticky note, not an “empower your fertility journey” lecture.
IVF dating usually starts from the embryo’s age on transfer day, not from a last period you never had. Under the common fertilization-length framework, you add about 263 days after a Day 3 transfer, 261 after Day 5, and 260 after Day 6. Frozen embryo transfer uses the same day-age idea from the FET date — freezer months do not become pregnancy weeks.
When a hospital form or period app still demands an LMP, an IVF LMP-equivalent (roughly EDD − 280) is a paperwork translation, not a claim that you menstruated that day. If you only have a due date, reverse dating walks backward into a conception window — honest ranges, not an exact Tuesday at 3:12pm.
Everything here is a planning estimate that runs in your browser. Ultrasound dating and your clinic’s policy still win when they disagree. Confirm medical, leave, and testing decisions with your care team.
Paper dates. Browser math. Clinic still has the last word.
Start from transfer
Fresh or frozen, the useful inputs are usually transfer date and Day 3 / Day 5 / Day 6 age. Open the IVF due date calculator, the how-to calculate due date from IVF page, or the FET landing if that is the language on your paperwork.
Start from an EDD or the wait
Only have a portal due date? Reverse into a conception window, or use the conception calculator / when did I conceive framing. In the two-week wait, try implantation and test timing.
FAQ
- What is PregDateBase?
- A set of free, browser-only date calculators for IVF/FET due dates, reverse conception from an EDD, implantation windows, pregnancy weeks, and light cycle support. It is estimate-only — not a clinic chart and not medical advice.
- How is an IVF due date usually calculated?
- Most clinics use fertilization-length math: about 266 days from fertilization, minus the embryo's age at transfer. That is why Day 5 is often transfer + 261, Day 3 is +263, and Day 6 is +260. Ultrasound policy can still update the official EDD later.
- Does FET use different due-date math?
- The day-age idea is the same. Freezer storage time does not become gestational age. Date from the FET day and the thawed embryo's Day 3 / 5 / 6 label.
- Why do period apps disagree with my IVF dates?
- Many apps force a last-menstrual-period field. If you invent a period you never had, they drift. Build an IVF LMP-equivalent from your EDD, or trust the clinic portal date.
- Can you tell me the exact day I conceived?
- Not honestly from a due date alone. Reverse and conception tools return a window of a few days — false precision helps no one.
- When does implantation usually happen?
- Often about 6–12 days after ovulation, with many sources clustering around 8–10 DPO. After embryo transfer, follow your clinic's beta schedule over generic DPO charts.
- Do my dates leave my device?
- Calculations are designed to run in your browser. There is no signup wall and no clinic EMR sync pretend.
- Is this medical advice?
- No. Planning estimates only. Confirm dating, testing, leave, and medical decisions with your clinic.
Estimate only — not medical advice. Dates stay in your browser. Confirm with your clinic.