Pregnancy Due Date Calculator
Estimate your due date and current week.
Estimated due date
Saturday, February 13, 2027
Currently
0w 0d
Trimester
1st
Estimated conception: Saturday, May 23, 2026
Based on Naegele's rule (LMP + 280 days, adjusted for cycle length). About 4% of babies arrive on the actual due date. Most arrive within two weeks either way. Always confirm with a doctor.
About
Pick the first day of your last period (or conception date if you know it) and the tool returns your estimated due date, current week and trimester. Adjusts for cycle length if it's not 28 days.
How to use
- Pick the start date method.
- Enter the date.
- Adjust cycle length if not 28 days.
- Read your due date and current week.
FAQ
How accurate is the due date?+
About 4% of babies arrive on the actual due date. Most arrive within two weeks before or after. An early ultrasound (8-13 weeks) is more accurate than LMP-based math.
Why does cycle length matter?+
Naegele's rule assumes a 28-day cycle and ovulation on day 14. If your cycle runs longer or shorter, you ovulate earlier or later, which shifts the due date.