How many weeks pregnant are you? Enter the date of the first day of your last menstrual period (LMP) and we'll calculate a week-by-week timeline for you.

Most healthcare practitioners calculate the age of your pregnancy by the number of weeks since your last period (menstrual age). If you want to know the gestational age of your fetus, simply enter the date of conception (or, as an estimate, 14 days before your period was due). Note: Your browser must be Java-enabled for the calculator to work.

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