How to estimate your date of delivery (EDD)

Find out your due date with our Pregnancy Due Date Calculator.

Based on a 28-day menstrual cycle we use Naegele’s Rule, is a standard way of calculating the due date. Actually about 2 weeks later is when you conceive (your pregnancy date is 2 weeks behind your fetal development).

Naegele’s Rule

First day of the last menstrual period (LMP), count back 3 months, add 7 days and add 1 year

LMP: December 18, 2018

Month Day Year
12 18 2018
-3 +7 +1
9 25 2019

If you were tracking your ovulation and you know the day you conceived, we can calculate your due date by counting 38 weeks from that date.

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