Use this calculator to determine your due date or the date your baby was conceived. To determine your due date, enter the date of your last menstrual period. If you already know your due date, you can enter that and "calculate backwards" when conception occurred. The bottom part of the form tells you how many weeks pregnant you are today or on the date of your choice. You can also determine on what date you will be the number of weeks pregnant that you enter.

(Days of the week are optional. The calculator will automatically determine them.)

Date of your last menstrual period:
  
 
 
Conception Occurred:
(about two weeks after last menstrual period)
First Trimester Ends (12 weeks) :
Second Trimester Ends:
(27 weeks)
 
Estimated Due Date:
On , you will be weeks pregnant.