Pregnancy Due Date Calculator

A pregnancy due date calculator estimates when your baby will be born based on the first day of your last menstrual period (LMP). Most pregnancies last about 40 weeks (280 days) from the LMP.

This calculator uses Naegele's rule, the standard method used by healthcare providers worldwide. It also shows your current week of pregnancy, trimester, and days remaining until your estimated due date.

Keep in mind that only about 5% of babies are born on their exact due date. Most babies arrive within two weeks before or after. Your healthcare provider may adjust your due date based on ultrasound measurements.

1. Enter the first day of your last period — This is the date used for the standard calculation.
2. View your due date — See the estimated delivery date, current week, trimester, and countdown.

Naegele's Rule: Due Date = LMP + 280 days (40 weeks)

Alternative: LMP + 1 year - 3 months + 7 days