Calculate due date, conception date, and pregnancy milestones.
For IVF: Due Date = Transfer Date + (280 − embryo age in days). For cycles longer than 28 days, add the extra days to the LMP base.
LMP: March 1, 2026 (28-day cycle)
Conception: ≈ March 15 | Due Date: December 6, 2026 | Currently Week 14 (2nd trimester)
Common Questions
Our free pregnancy calculator uses Naegele's Rule — the standard clinical method — to estimate your due date from your last menstrual period (LMP), conception date, or IVF transfer date. It shows your current week, trimester, and key developmental milestones.
The standard method: add 280 days (40 weeks) to the first day of your last menstrual period. This works for 28-day cycles — our calculator adjusts automatically for longer or shorter cycles. Only about 5% of babies are born on their exact due date; most arrive within 2 weeks before or after.
For IVF pregnancies, the due date is calculated from the egg retrieval or embryo transfer date rather than LMP. For a Day 5 (blastocyst) transfer: Due Date = Transfer Date + 261 days. For Day 3 transfer: Due Date = Transfer Date + 263 days.
First trimester: weeks 1–13 (organogenesis, highest miscarriage risk). Second trimester: weeks 14–26 (fetal growth, gender reveal possible, anatomy scan at week 20). Third trimester: weeks 27–40 (rapid weight gain, lung development, preparation for birth). Full term is considered week 39–40.
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