Pregnancy Due Date Calculator

Enter your last menstrual period (LMP) or conception date to calculate your estimated due date and pregnancy week.

Calculation method

Date of LMP

This calculator uses Naegele's rule (LMP + 280 days). Only 5% of babies are born on their exact due date. Always confirm with your OB/GYN or midwife.

Naegele's rule calculates EDD as LMP + 9 months + 7 days (or LMP + 280 days). It assumes a 28-day menstrual cycle with ovulation on day 14.