Due Date Calculator

Track your due date instantly with our free Due Date Calculator. Fast, accurate health calculations — no sign-up needed.

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How the Due Date Calculator Is Calculated

This calculator uses Naegele’s Rule, the standard obstetric method for estimating a due date: it adds 280 days (40 weeks) to the first day of your last menstrual period.

About the Due Date Calculator

Track your due date instantly with our free Due Date Calculator. Fast, accurate health calculations — no sign-up needed.