Pregnancy Calculator

Use this pregnancy calculator to work out the likely conception date and to estimate how many weeks you have been pregnant. Input the date of your last menstrual period (which is the first day of your last period) and then click on the calculate button.

Enter date of your last period
(the first day of your last period)

Day

Month

Year
 
Click to calculate.  
Estimated date of conception  
Estimated stage of pregnancy  

Please note that this calculator only estimates dates based on a 28 day menstrual cycle and might not be accurate for women whose cycle varies from that schedule. For more accurate estimates please speak with your doctor.