Pregnancy Calculator · Free, no signup

Calculate your baby's
due date

Enter your last menstrual period (LMP) or conception date to get your estimated due date, current week, and pregnancy milestones.

Due Date —
Current Week —
Days Until Due —
Trimester —

Pregnancy Milestones

Week 12
End of first trimester · First ultrasound typically done
Week 20
Anatomy scan · Halfway through pregnancy
Week 28
Start of third trimester
Week 37
Full term · Baby can arrive any day

How is the due date calculated?

From LMP: We add 280 days (40 weeks) to the first day of your last menstrual period. This follows Naegele's rule, the standard medical calculation.

From Conception: We add 266 days (38 weeks) to your conception or IVF transfer date, then adjust for gestational age.

Note: Only about 5% of babies arrive exactly on their due date. Most babies arrive within 2 weeks before or after. Always consult your healthcare provider for personalized medical advice.