Calculate your ovulation dates

Enter first day of your last menstrual period

Average length of menstrual cycle (days)

Calculated ovulation date
Your most fertile forthcoming date

Calculate from menstruation Date of your last menstrual period: Select month and date.


Results
Conception Occurred:
(Assumed to have occurred about two weeks after last menstrual period)
First Trimester Ends (12 weeks):
Second Trimester Ends (27 weeks):

Calculate backwards from due date Estimated Due Date (40 weeks) :

Calculate from menstruation