How to Calculate Birth Date by Date of Conception

Pregnancy is an exciting and stressful time for parents. Knowing your baby's due date gives the feeling of having a measure of control during a time when things can feel very out of control. Medical professionals traditionally calculate due dates by counting 40 weeks from the first day of the mother's last menstrual cycle. In order to calculate birth date using date of conception, the calculation instead assumes that conception took place during a woman's most fertile time of the month. According to WebMD, that time is exactly in the middle of the 28 days between the starts of menstrual periods.

Instructions

    • 1

      Locate the date of conception on your calendar.

    • 2

      Count 38 weeks through the calendar.

    • 3

      Read off the estimated date of your baby's birth.

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