Pregnancy Due Date Calculator
Estimate your baby's due date and key pregnancy milestones from the first day of your last menstrual period (LMP).
Enter your details
How many days ago did your last period start?
Your results
- Gestational age
- 8 weeks, 4 days
- Trimester
- First trimester
- Conception (est.)
- May 4, 2026
How Due Dates Are Calculated
Naegele's rule adds 280 days (40 weeks) to the first day of your last menstrual period. It assumes a 28-day cycle with ovulation on day 14.
Only about 4% of babies arrive on the exact due date. A normal full-term pregnancy is anywhere from 37 to 42 weeks.
Important Milestones
- •Week 12 — End of first trimester; risk of miscarriage drops sharply.
- •Week 20 — Anatomy scan, often gender reveal.
- •Week 24 — Viability threshold.
- •Week 37 — Full term begins.
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Frequently Asked Questions
What if my cycle is irregular?
An early ultrasound (before 13 weeks) is more accurate than LMP for irregular cycles.
Is the due date guaranteed?
No — it's a 5-week window around the date. Only about 1 in 25 babies are born on the exact day.
Related Calculators
See how far along you are, your trimester, and weeks remaining.
Find your fertile window and most likely ovulation date.
Estimate the best days to conceive based on your cycle.
Predict your next 3 periods based on your cycle.