Pregnancy Due Date
Calculate estimated due date (EDD) and current gestational age using Naegele's rule from last menstrual period. Shows trimester and key milestone dates.
Educational tool. Not a substitute for clinical judgment, professional diagnosis, or treatment. Always verify with current guidelines.
How to use the pregnancy due date
Pick the first day of the last menstrual period (LMP). The estimated due date and current gestational age are computed.
Formula & explanation
Naegele's rule: EDD = LMP + 280 days (40 weeks). Gestational age = days since LMP, expressed in weeks + days.
Examples
LMP 2026-01-01 → EDD 2026-10-08.
Frequently asked questions
- Is this accurate?
- Naegele's rule assumes a 28-day cycle and ovulation on day 14. First-trimester ultrasound is more accurate.
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