Pregnancy Calculator
Calculate your due date and pregnancy milestones.
Results
Estimated Due Date
--
About Pregnancy Calculation
Pregnancy is calculated from the first day of your last menstrual period (LMP). Conception typically occurs about 14 days after LMP in a regular 28-day cycle.
A full-term pregnancy is considered 40 weeks (280 days) from LMP. Your healthcare provider will use this date to track your pregnancy progress and schedule prenatal care.
Frequently Asked Questions
How is pregnancy due date calculated?
A pregnancy due date is typically calculated by adding 280 days (40 weeks) to the first day of your last menstrual period, assuming a 28-day cycle and ovulation on day 14.
What are the trimesters?
First trimester: Weeks 1-13, Second trimester: Weeks 14-27, Third trimester: Weeks 28-40. Each trimester brings different developmental milestones.
Is the due date accurate?
Only about 5% of babies are born on their due date. A due date is an estimate, and most babies arrive within 2 weeks before or after.