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We provide loving support and community resources to expectant parents facing an unplanned pregnancy.

Pregnancy Due Date Calculator
Calculation method
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Due Date Calculator

This due date estimator can tell you your expected due date. Due dates are calculated by adding 280 days (40 weeks) to the first day of your last menstrual period.

The first day of your last menstrual period is how most doctors estimate a mother’s due date.  However, it is only an estimated due date—not a deadline for your baby’s arrival.  Only 4 percent of babies are born on their estimated due date.

Your doctor will give you an official due date once you begin receiving prenatal care, but pregnancy calculators can give you a good estimation of when your baby is due.

Pregnancy Due Date Calculator - Responsive
Calculation method
📅
📅

Due Date Calculator

This due date estimator can tell you your expected due date. Due dates are calculated by adding 280 days (40 weeks) to the first day of your last menstrual period.

The first day of your last menstrual period is how most doctors estimate a mother’s due date.  However, it is only an estimated due date—not a deadline for your baby’s arrival.  Only 4 percent of babies are born on their estimated due date.

Your doctor will give you an official due date once you begin receiving prenatal care, but pregnancy calculators can give you a good estimation of when your baby is due.

Can My Due Date Change?

Yes.  There are several reasons your due date can change. 

Some of those reasons are…

  • You have irregular periods causing the date of your last menstrual period to be incorrect.
  • Your early ultrasound dating was incorrect.
  • Sometimes, the due date can change if your first ultrasound is done in the second trimester of your pregnancy.
  • The blood test indicates that certain levels are not where they should be at this point in the pregnancy.

Determining your baby’s due date can produce mixed emotions. We are here to help you navigate these feelings and walk with you through the next steps in your pregnancy.

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