Calculate your pregnancy due date, conception date, and trimester milestones using LMP or ultrasound dates with clinical accuracy.
A pregnancy due date calculator estimates baby's arrival date based on last menstrual period (LMP) or conception date using standard 280-day (40-week) gestational period. Calculates estimated due date, current pregnancy week, trimester, fetal development milestones, and important appointment timing. Uses Naegele's Rule: LMP date + 280 days (or LMP + 7 days - 3 months + 1 year). Only 5% of babies arrive exactly on due date, with 90% born within 2 weeks either side. Essential for expecting parents planning pregnancy, tracking development, scheduling prenatal appointments, and preparing for baby arrival.
Know exact pregnancy timeline for planning maternity leave, baby room preparation, baby shower scheduling, and birthing class registration. Track fetal development week-by-week: when heart starts beating (week 6), when baby can hear (week 18), when lungs mature (week 34). Schedule prenatal appointments appropriately: first appointment at 8-10 weeks, anatomy scan at 18-22 weeks, glucose screening at 24-28 weeks, weekly checkups after week 36. Coordinate work planning: notify employer, arrange leave, train replacement, complete projects before maternity leave. Understand full-term timing: babies born before 37 weeks are premature, 37-39 weeks are early term, 39-41 weeks are full term (optimal), 42+ weeks are overdue (may need induction). Share timeline with family planning visits, support during labor and delivery.
Enter first day of last menstrual period (LMP) or conception date if known through fertility tracking or IVF. Calculator shows estimated due date, current week of pregnancy (gestational age), current trimester (1st: weeks 1-13, 2nd: weeks 14-27, 3rd: weeks 28-40), and countdown to due date. Results include fetal development milestones by week, suggested prenatal visit schedule, and trimester-specific guidance. Most accurate if calculated within first trimester; ultrasounds at 8-13 weeks can adjust EDD by measuring fetal size. Track pregnancy using apps that provide week-by-week development details, symptom tracking, weight monitoring, and appointment reminders. Plan for due date +/- 2 weeks buffer: prepare baby essentials by week 35, arrange hospital bag by week 37.
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