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Pregnancy Due Date Calculator

This interactive Due Date Calculator will help you estimate the date your baby will arrive. Pregnancy usually lasts 40 weeks (280 days) from the first day of your last menstrual period.

This calculator is a general guide - every pregnancy is unique so consult with your doctor because some babies arrive sooner or later than expected.

What was the date of the first day of your last menstrual period?

Average Length of Menstrual Cycles:

When you first learn you are pregnant

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