EDD calculator (multi-mode)
EDD means estimated due date. This workbench keeps modes together: LMP, conception, ovulation, or IVF/FET transfer. Use it when you know which input you actually have. Estimate only — not medical advice.
Enter a date to see an estimate.
What this page does
We intentionally do not position this page as a clone of the ultra-competitive bare “due date calculator” head term. The bet is mode clarity: pick LMP, ovulation, conception, or IVF and see the matching arithmetic.
Only about 5% of births land on the EDD — say that out loud. Ultrasound redating still wins clinically.
When to use
You bounce between input types; you want one bookmarkable URL for all modes.
When not to
Day-5 FET-only users may prefer the specialized FET page. Clinical redating after ultrasound — clinic wins.
Assumptions
LMP: EDD = LMP + 280 + (cycleLength − 28). Conception/ovulation: +266. IVF: transfer + (266 − embryo age).
Examples
LMP Mar 1, 2026 · cycle 28 → EDD Dec 6, 2026.
LMP Mar 1, 2026 · cycle 35 → EDD Dec 13, 2026 (+7).
Day 5 transfer Mar 10, 2026 → EDD Nov 26, 2026.
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.
Mode table: LMP +280 (± cycle) · ovulation/conception +266 · IVF transfer +(266−age).
Related calculators
LMP-only: LMP due date. Ovulation-only: due date from ovulation. IVF: IVF due date. Reverse: reverse due date. We do not chase the generic due-date head-term war.
See also: lmp due date calculator, ovulation to due date calculator, ivf due date calculator, and gestational age calculator.
FAQ
- What does EDD mean?
- Estimated due date.
- Which mode should I pick?
- Whatever date you actually know.
- Is EDD the same as a due date calculator?
- Same family of math; different search battlegrounds.
- Can I enter ultrasound measurements?
- Not in v1 — no CRL field.
- Why won’t this promise the delivery day?
- Physiology does not work that way.
- Is this medical advice?
- Estimate only — not medical advice. Confirm dating, testing, and medical decisions with your clinic.