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Pregnancy Calculator

This calculator estimates your baby's due date based on your approximate date of conception. Your conception date will be calculated based on your last menstrual period, your average cycle length, and luteal phase.

Remember, the due date is only an estimate and you should always consult with your doctor. Only about 1 in 20 births occur on the predicted due date, so for most women, there will be a margin of error of a few weeks on either side of the due date.
Member, but not logged in? Simply login and your tracking history will fill in the last period and average cycle length fields below!
Due Date Based on Your Approximate Conception Date
First day of your last menstrual period:
Your average menstrual cycle length: days.
Your average luteal phase length days.
How the Pregnancy Calculator Works

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