Due Date Calculator

Calculate your baby's estimated due date based on your last menstrual period.

Enter Your Information

First Day of Last Menstrual Period

Enter the first day of your last period (LMP)

About Due Dates

This calculator estimates your due date based on a 40-week (280 day) pregnancy from the first day of your last menstrual period (LMP).

Note: Only about 5% of babies are born on their exact due date. Most babies arrive within 2 weeks before or after the estimated date.

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