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Baby Due Date Calculator

Our online tools will provide quick answers to your calculation and conversion needs. On this page, newly pregnant moms can calculate the due date or expected date of baby's birth and the current week of pregnancy. The baby due date is merely an estimate since it is difficult to tell the exact date of conception.

Find baby due date, conception date & current week from first day of last period

(yyyy-mm-dd):

Android: Use this pregnancy calculator offline with our all-in-one calculator app.

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Due date calculation

Your doctor will count the start of your pregnancy from the first day of your last menstrual period. That's about two weeks ahead of when conception actually occurs.

Our calculation is based on Naegele's Rule, which is a standard way of calculating the due date for a pregnancy.

Due date formula
Due date = First day of last menstrual period + 1 year - 3 months + 7 days

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