Due Date Calculator

This calculator to determine the milestones during your pregnancy. Your health care provider uses the number of weeks since your last menstrual period to describe how far along you are in your pregnancy. 

Enter the first day of your last menstrual period, then press 'Calculate.
  Month: Day: Year:

Calculated Result

Conception likely occurred around:
(Approximately two weeks after
your last menstrual period)
Period of greatest risk for birth defects:
Five to ten weeks gestational age (number of weeks since your last menstrual period)

Beginning of organ formation: Five Weeks
Gestational Age
Major organs have formed: Ten Weeks
Gestational Age
End of first trimester
(12 weeks) - Risk of
miscarriage decreases:
11 to 14 Weeks
Gestational Age
Some preemies can now
survive (23 weeks):
23 Weeks
Gestational Age
End of second
trimester (27 weeks):
Estimated due date
(40 weeks - full term):

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