Pregnancy Conception Calculator
Estimate when you conceived based on your due date.
Estimated Conception Date
What is this Online Pregnancy Conception Calculator for?
This calculator works backwards from your due date to estimate the date of conception. It is useful if you know your due date from an ultrasound but want to know when the baby was likely made.
How does it work?
It subtracts 266 days (38 weeks) from the due date, which represents the average gestation period from fertilization to birth.