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Conception Date Calculator

Our online tools will provide quick answers to your calculation and conversion needs. On this page, pregnant moms can calculate the conception date and weeks into pregnancy from the due date or expected date of baby's birth. The conception date is merely an estimate since it is difficult to know when ovulation exactly occurs.

Find baby conception date & current week from

due date (yyyy-mm-dd):

Use this pregnancy calculator to find baby due date and/ or conception date from menstruation date.

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

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Conception date calculation

We assume that the estimated due date is 40 weeks from the first day of the last period in your pregnancy calculation and that the conception occurs two weeks into your menstrual cycle.

The formula:
Conception date = due date - 40 weeks + 14 days

Reference: Naegele's rule

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