Pregnancy Date Calculator
Use Naegele’s rule, adjusted for a 21–35 day average cycle, to estimate a due date, conception timing, gestational age, and milestones. It is educational only; it cannot confirm pregnancy, fertility, ovulation, or a delivery date. Calculate it clearly with Figur.
Pregnancy Date Calculator
Use Naegele’s rule, adjusted for a 21–35 day average cycle, to estimate a due date, conception timing, gestational age, and milestones. It is educational only; it cannot confirm pregnancy, fertility, ovulation, or a delivery date.
Method and assumptions
Figur applies Naegele's rule: 280 days from the first day of the last menstrual period, adjusted by average cycle length minus 28 days; it estimates conception as LMP + cycle − 14 and gestational age from LMP.
- The entered average cycle is 21–35 days and the LMP is an accurate date.
- Dates are calendar estimates; cycle timing, ovulation, and clinical dating can differ.
- Ultrasound findings, assisted reproduction, and adjustments made by a prenatal clinician are not incorporated.
Educational information, not medical advice or a diagnosis. Consult a qualified health professional for care, symptoms, fertility, pregnancy, or nutrition needs.
Sources and references
Frequently asked questions
Is the due date guaranteed?
No. It is an estimate. A prenatal clinician can use history and ultrasound when clinical dating is appropriate.
Does this predict fertile days?
No. Cycle timing can vary, so this tool is not contraception and does not guarantee fertility or conception.