Find your estimated due date, current pregnancy week, and trimester.
A full-term pregnancy is 40 weeks (280 days) from your LMP. Most babies are born between weeks 37 and 42. Only about 5% of babies are born exactly on their due date — it's an estimate, not a deadline.
The Naegele's Rule (the standard formula) adds 280 days to your LMP. If your cycle differs from 28 days, the calculator adjusts accordingly by adding or subtracting the difference.
The estimated due date (EDD) based on LMP is accurate within 1–2 weeks for most women with regular cycles. An early ultrasound (before 14 weeks) is the most accurate dating method, with a margin of ±5–7 days.
This calculator adjusts for cycle length. If your cycle is 30 days, ovulation typically occurs on day 16 instead of day 14, so the due date shifts by 2 days. Enter your actual average cycle length for a better estimate.
Gestational age counts from the first day of your LMP — so you are 2 weeks "pregnant" at the moment of conception. Fetal age (embryonic age) counts from conception and is always about 2 weeks less than gestational age.
Yes. Enter the first day of your last period (before the missed period). Most home tests are taken around week 4–5 of gestational age.
Your due date is the 40-week mark. Full term is 39–40 weeks; early term is 37–38 weeks. Babies born at 37+ weeks are considered term and generally healthy. Pre-term is before 37 weeks.