Pregnancy Due Date Calculator – When Is My Baby Due?
Find your estimated due date instantly with our pregnancy calculator. Enter the date of your last period or conception date to get a personalized birth timeline and week-by-week breakdown.
Choose your calculation method
Select either last menstrual period (LMP) or conception date as your starting point.
Enter the date and cycle length
Input your LMP or conception date. For LMP, also select your average cycle length.
Get your due date and timeline
Receive estimated due date, conception date, current week, and trimester breakdown.
Prenatal care planning
Schedule important screenings and appointments at the right times.
Monitor baby's development
Track weekly milestones and growth expectations throughout pregnancy.
Prepare for arrival
Plan maternity leave, nursery setup, and baby preparations on schedule.
Cycle adjustment
Accounts for cycles longer or shorter than the standard 28 days.
Trimester awareness
Know which trimester you're in for symptom and milestone tracking.
How is due date calculated from LMP?
Add 280 days (40 weeks) to the first day of your last period. This is Naegele's rule, the standard method used by healthcare providers.
Can I calculate due date from conception?
Yes, add 266 days (38 weeks) to the conception date. This is more accurate if you know when ovulation occurred.
How accurate are due dates?
Only 5% of babies arrive on their due date. Most are born within 2 weeks before or after. Ultrasound dating is most accurate in first trimester.
Does cycle length affect due date?
Yes, longer cycles mean later ovulation and a later due date. This calculator adjusts for cycles from 24-35 days.
When should I take a pregnancy test?
Test about 14 days after conception or when your period is late. First morning urine gives the most accurate result.
Try our other pregnancy calculators: the pregnancy week calculator to track current progress, the pregnancy weight gain calculator for healthy guidelines, and the ovulation calculator for conception planning.
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