Pregnancy Due Date Calculator
Estimate your due date, current week and trimester from your last menstrual period.
Select the first day of your last menstrual period to begin.
Enter the first day of your last menstrual period to estimate the due date (LMP + 280 days).
How to use
- Select the first day of your last menstrual period.
- The due date is estimated as LMP plus 280 days.
- Read the current pregnancy week and trimester.
Frequently asked questions
- How is the due date calculated?
- It uses Naegele's rule: 280 days (40 weeks) added to the first day of your last menstrual period.
- Is this accurate?
- It is a common estimate only and not medical advice. Actual dates vary with cycle length; confirm with an ultrasound and your doctor.