Pregnancy Due Date Calculator

Estimate a pregnancy due date from the first day of the last menstrual period.

First day of last menstrual period

Estimated due date

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Approximate conception date—

Due-date estimate

This uses the standard 280-day estimate from the first day of the last menstrual period. Ultrasound dating and clinical history may provide a different date.

Important: This is only an estimate and does not replace prenatal care or advice from a qualified clinician.