IVF Due Date Calculator
Estimate your IVF due date from embryo transfer day or a fresh-cycle date, with gestational age, trimester milestones, and a downloadable summary.
IVF Due Date Calculator
Day 6 embryos can shift by ±1 day depending on the culture and transfer protocol, so confirm the final date with your clinic.
Fresh-cycle helper formula: retrieval/fertilization date + 266 days
Check your inputs and click Calculate.
The chart library could not load, so the tool is showing text and table output instead. Check the detail table below.
| Item | Value |
|---|---|
| Mode | – |
| Base date | – |
| Embryo age | – |
| Estimated conception date | – |
| LMP-equivalent date | – |
| Due date (EDD) | – |
| 37 weeks (full term) | – |
| End of 1st trimester (13 weeks) | – |
| End of 2nd trimester (27 weeks) | – |
| Formula used | – |
What is an IVF Due Date Calculator?
An IVF due date calculator estimates your expected delivery date (EDD) from the embryo transfer date and embryo age (Day 3, Day 5, or Day 6), or from the retrieval/fertilization date in a fresh cycle. It is designed for IVF pregnancies rather than standard LMP-based dating.
Because IVF pregnancies use a different reference point than spontaneous pregnancies, it helps to compare your treatment timeline separately from a general due date calculator before appointments, travel plans, or leave scheduling.
When this tool is useful
- When you want to double-check the due date given on transfer day
- When you want to compare Day 3, Day 5, and Day 6 embryo timelines
- When you need a fresh-cycle helper estimate from retrieval/fertilization date + 266 days
- When you are planning prenatal visits, leave dates, or family events around IVF milestones
Key features
- IVF-specific formula — EDD = transfer_date + (266 – embryo_day)
- Embryo age support — Day 3 (+263), Day 5 (+261), and Day 6 (+260)
- Fresh-cycle helper mode — retrieval/fertilization date + 266 days
- 40-week progress bar and chart — a quick visual view of elapsed and remaining time
- Detailed table and download — save key dates for notes or planning
- Medical disclaimer — makes it clear that the final due date should come from your care team
How to use it
- Select a mode: choose embryo transfer date or fresh cycle (retrieval/fertilization date).
- Enter the relevant date: use the date field for the mode you selected.
- Choose embryo age (transfer mode): select Day 3, Day 5, or Day 6 based on the embryo that was transferred.
- Run the calculation: the result area updates with the summary, progress bar, and detail table.
- Copy or download: save the result for appointment notes or personal planning.
Calculation basis and references
1) Core formulas
- Main formula: EDD = transfer_date + (266 – embryo_day)
- Day 3 embryo: transfer date + 263 days
- Day 5 embryo: transfer date + 261 days
- Day 6 embryo: transfer date + 260 days
- Fresh-cycle helper: retrieval/fertilization date + 266 days
Day 6 embryos can vary by about ±1 day depending on how the clinic defines culture and transfer timing, so always use your clinic or OB-GYN’s final dating when they provide it.
2) Official references (HTTPS) and checked date
Checked on: February 22, 2026
- ACOG – Methods for Estimating the Due Date (checked on February 22, 2026)
- NCBI StatPearls – Pregnancy Dating (checked on February 22, 2026)
- NICE Guideline CG156 – Fertility problems (checked on February 22, 2026)
- HFEA – In vitro fertilisation (IVF) (checked on February 22, 2026)
3) Medical disclaimer
This tool is a planning aid. The final due date and gestational age should be confirmed by your care team using ultrasound findings and clinical judgment.
Frequently asked questions
How is this different from a standard due date calculator?
A standard due date calculator uses the first day of your last menstrual period (LMP), while an IVF due date calculator uses embryo transfer date and embryo age, or a retrieval/fertilization date. If you need a non-IVF estimate, use the general due date calculator.
Why do Day 3, Day 5, and Day 6 embryos use different day counts?
The embryo has already developed for a certain number of days before transfer, so the conception point must be adjusted backward by the embryo age. That is why the formula becomes EDD = transfer_date + (266 – embryo_day), which gives +263, +261, or +260 days for Day 3, Day 5, and Day 6 embryos.
Why should I be extra careful with Day 6 embryo results?
Day 6 embryos can be documented slightly differently across clinics, which can create an interpretation difference of about ±1 day. Use the calculator as a reference and follow the final date confirmed by your clinic.
What does +266 days mean in fresh-cycle mode?
It is a helper estimate based on the average 266 days between conception and due date. Because protocols and documentation can vary, any official date provided by your clinic should take priority over this estimate.
What should I do if the calculator differs from my clinic’s date?
Always use the date given by your clinic or OB-GYN. This calculator is meant for planning and note-taking, but your care team should confirm the final due date.
Is my data stored on the server?
Your inputs are stored only in your browser’s local storage and are not sent to the server. If you clear your browser data, the saved values are removed as well.
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