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Due Date Calculator

Due Date Calculator

Calculate your estimated due date from your last menstrual period or conception date.

Enter Your Values
Results

Fill in your values above and click Calculate.

Frequently Asked Questions

The standard method (Naegele's Rule) adds 280 days (40 weeks) to the first day of your last period. Only 5% of babies are born on their exact due date.
For longer cycles, the due date is later. For shorter cycles, it's earlier. This calculator adjusts automatically for your cycle length.