Calculate your estimated due date
Estimate your due date, current gestational age and the next clinical milestones. An indicative calculation based on Naegele's rule adjusted by your cycle length.
Estimated due date
Gestational age—
Current trimester
Estimated conception date
Pregnancy timeline
0%1st trimester 2nd trimester 3rd trimester
Week 8 First ultrasound and confirmation
Ideally between weeks 6 and 8, embryo viability and heartbeat are confirmed and prenatal care begins with baseline labs.
Week 12 First trimester screening
Between week 11 and 13.6 the early morphologic ultrasound and aneuploidy screening (nuchal translucency, biochemical markers) are performed.
Week 20 Anatomy ultrasound
Detailed study of fetal anatomy, placental assessment and cervical length. One of the most anticipated milestones of pregnancy.
Week 24 Oral glucose tolerance test
Between week 24 and 28, gestational diabetes is screened with the glucose curve and prenatal monitoring intensifies.
Week 32 Growth and fetal wellbeing
Ultrasound to evaluate fetal growth, amniotic fluid and position. Visits become every two weeks.
Week 36 Preparing for birth
Vaginal-rectal culture for group B streptococcus, birth plan and weekly visits until the due date.
Important: This calculator is indicative and does not replace medical evaluation. The actual date may vary depending on ovulation, later ultrasounds and clinical factors.
How is it calculated?
Naegele's rule is applied: 280 days (40 weeks) are added to your last menstrual period, adjusting for cycle length when different from 28 days. It is a statistical starting point fine-tuned with first-trimester ultrasound.
Why does it matter?
Knowing an estimated due date helps organize the prenatal schedule, plan key studies by trimester, anticipate clinical milestones and offer closer follow-up tailored to your individual conditions.
