How to Translate Weeks of Pregnancy Into Months

A full-term pregnancy lasts 40 weeks. Weeks of pregnancy do not translate exactly into months if you simply divide by four. This is because there are four and one-third weeks in each month on average. Although your doctor will measure your pregnancy precisely by number of weeks, most people refer to pregnancy in terms of nine months.

Instructions

    • 1

      Count the number of days since your last menstrual period started. Although you may have ovulated a week to two weeks after the first day of your last menstrual period, this is how your doctor will date the start of your pregnancy.

    • 2

      Divide by seven to find the number of weeks you have been pregnant.

    • 3

      Divide the number of weeks pregnant you are by 4.33. For instance, if you are nine weeks pregnant: 9 divided by 4.33 = 2.04, which is just over two months.

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