Free tool

Pregnancy due date (EDD) calculator

Enter the first day of the last period to see the expected due date, how many weeks pregnant you are today, and the usual scan windows.

First day of last menstrual period (LMP)

Usual cycle length (days)

Usually 28. Between 21 and 45 adjusts the date.

Estimated due date

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Enter the LMP date

Calculated by Naegele's rule (LMP + 280 days). An early ultrasound gives the most accurate date; your doctor may adjust it.

For information only; not a substitute for a consultation. Nothing you type here is saved or sent anywhere.

Use these inside every consultation

LazzyDr works out BMI, EDD, weeks of pregnancy and child doses for you while you consult.