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Pregnancy Due Date Calculator &
Conception Calculator

When is your baby due? Use this pregnancy calculator from Motherhood Center to find your due date based on the date of your last menstrual period or conception date.

Disclaimer: This calculator is for educational purposes only. This is not a diagnosis. The calculations provided are estimates based on averages.


Are you expecting a baby? One of the first things you’ll want to know is your due date. While only about 5% of babies are born on their exact due date, having an estimate helps you and your healthcare provider plan for your pregnancy journey.

What is an estimated due date during pregnancy?

An estimated due date (EDD) is the approximate day when your baby is expected to be born. It’s typically calculated as 40 weeks from the start of your last menstrual period or 38 weeks from conception. Remember, this is just an estimate – your baby might arrive a little earlier or later!

Calculating your due date

There are two main methods to estimate your due date:

First day of last period

This is the most common method used by healthcare providers:

  • Start with the first day of your last menstrual period (LMP)
  • Add 280 days (40 weeks) to that date

This method assumes a 28-day menstrual cycle, with ovulation occurring on day 14. Your healthcare provider might adjust the due date if your cycle is longer or shorter.

Conception date

If you know your conception date (perhaps from tracking ovulation or fertility treatments), you can:

  • Start with the date of conception
  • Add 266 days (38 weeks) to that date

This method can be more accurate if you’re confident about your conception date, but it’s often harder to pinpoint precisely when conception occurred.

Remember, your due date is just an estimate, depending on which method you use. Every pregnancy is unique, and your baby will arrive when they’re ready!

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