Pregnancy Due Date
Calculate your estimated due date and pregnancy milestones.
What is Pregnancy Due Date?
A Pregnancy Due Date Calculator estimates your expected delivery date (EDD), current gestational age, and key pregnancy milestones based on the first day of your last menstrual period (LMP) or your conception date. Most pregnancies last approximately 280 days (40 weeks) from the first day of the last menstrual period — this is the Naegele's rule calculation that obstetricians and midwives have used for over a century.
The calculator uses either the LMP method (most common, as the exact conception date is often unknown) or the conception date method (useful for those who know their ovulation date or used assisted reproduction). For IVF pregnancies, a separate calculation adjusts based on the embryo transfer date and embryo age at transfer. Ultrasound-based due dates, measured in the first trimester, are the most accurate and may adjust the calculated EDD.
Beyond the due date, this tool provides a week-by-week pregnancy timeline marking critical developmental milestones — first heartbeat detection around week 6, nuchal translucency screening at 11–13 weeks, anatomy scan at 18–20 weeks, and viability milestones. Expectant parents use these milestones to plan prenatal appointments, understand fetal development stages, prepare financially and logistically, and communicate pregnancy progress to family.
How to Use Pregnancy Due Date
- 1Step 1: Select your calculation method: Last Menstrual Period (LMP) for most women, or Conception Date if you know precisely when you conceived (especially useful for IVF patients).
- 2Step 2: Enter the date — either the first day of your last menstrual period or your conception/ovulation date — using the calendar date picker.
- 3Step 3: For LMP method, enter your average cycle length if it differs from the standard 28 days. Women with longer or shorter cycles will have adjusted due dates.
- 4Step 4: Click Calculate to see your estimated due date, current gestational age in weeks and days, trimester you are in, and the date each trimester begins and ends.
- 5Step 5: Review the milestone timeline showing key prenatal appointments and fetal development markers week by week, which you can use to schedule OB/GYN visits.
Benefits of Using Pregnancy Due Date
- ✓Instant Due Date Estimation: Calculate your estimated delivery date immediately upon discovering pregnancy, before your first OB appointment, to begin planning and preparation.
- ✓Gestational Age Tracking: Know your exact pregnancy week and day at any point, which is essential for understanding symptom timelines and scheduling appropriate prenatal tests.
- ✓Trimester Milestone Planning: Understand when each trimester begins and ends so you can plan travel, work leave, and major decisions around your pregnancy progression.
- ✓Prenatal Test Scheduling: Identify the optimal windows for nuchal translucency ultrasound (11–13 weeks), NIPT blood tests (10+ weeks), and anatomy scan (18–20 weeks).
- ✓Family Communication: Share your due date and current gestational age clearly with family, employers, and support networks who ask about your pregnancy progress.
- ✓Multiple Method Comparison: Compare LMP-based and conception-based due date calculations to understand any discrepancy and discuss with your healthcare provider.
Example
About Pregnancy Due Date
Pregnancy Due Date Calculator estimates the expected delivery date based on the first day of the last menstrual period (LMP) using Naegele's rule, adding 280 days. It also shows the current gestational age and key trimester milestones. Provides a helpful week-by-week pregnancy overview.
- Due date from LMP date
- Current gestational age display
- Trimester milestone dates
- Week-by-week overview