Calculate your pregnancy due date based on your last menstrual period, conception date, IVF transfer, or ultrasound dating. Track your pregnancy progress and milestones.
Estimated Due Date
Oct 13, 2026
Tuesday
Currently
8w 0d
First Trimester
Enter the first day of your last menstrual period (LMP).
8
Weeks
0
Days
1
Trimester
20%
Complete
Trimester 1
Weeks 1-12
Trimester 2
Weeks 13-26
Trimester 3
Weeks 27-40
Week 6: Heartbeat visible on ultrasound
Feb 17, 2026
Week 12: End of First Trimester
Mar 31, 2026
Week 18: Gender can often be determined
May 12, 2026
Week 20: Anatomy scan (mid-pregnancy ultrasound)
May 26, 2026
Week 24: Viability milestone
Jun 23, 2026
Week 27: End of Second Trimester
Jul 14, 2026
Week 37: Baby is full term
Sep 22, 2026
Week 40: Estimated Due Date
Oct 13, 2026
This calculator provides an estimate only. Only about 5% of babies are born on their due date. Most births occur between 38-42 weeks. Always consult with your healthcare provider for accurate dating and prenatal care. Ultrasound dating performed in the first trimester is generally the most accurate method.
Estimated Due Date
Oct 13, 2026
Tuesday
Currently
8w 0d
First Trimester
Explore how changes affect your results
Based on your results
At 8 weeks and 0 days, you're 20% through your pregnancy with 224 days until your due date.
Only 5% of babies arrive on their due date. 80% are born within 2 weeks of it (38-42 weeks). First-time mothers often deliver closer to 41 weeks.
Early pregnancy is when major organs form. Take prenatal vitamins and avoid harmful substances.
Due date is calculated as 280 days (40 weeks) from the first day of your last menstrual period (LMP), or 266 days (38 weeks) from conception. Naegele rule: LMP + 7 days - 3 months + 1 year = EDD. Only 5% of babies arrive on their due date; most arrive within 2 weeks before or after. Calculate at practicalwebtools.com.
The most common method uses Naegele's rule: Add 280 days (40 weeks) to the first day of your last menstrual period (LMP). This assumes a 28-day cycle with ovulation on day 14. Only about 5% of babies arrive on their exact due date.
For IVF pregnancies, the due date is calculated from the embryo transfer date. For a Day 3 embryo transfer, add 263 days. For a Day 5 (blastocyst) transfer, add 261 days. This is more accurate than LMP dating.
Early ultrasounds (before 12 weeks) can date pregnancy more accurately by measuring the embryo. If there's a difference of more than 7 days from LMP dating, doctors often use the ultrasound date. Later ultrasounds are less accurate for dating.
Full term is 39-40 weeks. Early term is 37-38 weeks, late term is 41 weeks, and post-term is 42+ weeks. Babies born between 37-42 weeks are generally considered healthy, though outcomes are best at 39-40 weeks.
Due dates are estimates. Only about 5% of babies are born on their due date. About 80% are born within 2 weeks of the due date (38-42 weeks). First-time mothers often deliver closer to 41 weeks.
Estimated Due Date
Oct 13, 2026
Tuesday
Currently
8w 0d
First Trimester