Fertility-Facts.com ~ Ovulation Calculator

Ovulation Calculator

For best results enter in the dates of the first day of your last three menstrual periods. If you can not remember these three dates, then enter in the first day of your last menstrual period.

Beginning of last menstrual period:

Based on the average menstrual cycle of 28 days, your preceding menstrual period was on: (if this is incorrect, and you know the date feel free to change the date calculated below)

Menstrual period before the above:

For even more accurate calculation a preceding date is needed: (if this is incorrect, and you know the date feel free to change the date calculated below)

Preceding menstrual period:
(approximately 3 months ago)

Your menstrual cycle is approximately:	days long
Date of next period should be:

Fertility information:


Most Fertile Begin fertile period	Ovulation End fertile period

CAUTION: This calendar should not be used to prevent pregnancy. For cycles shorter than 21 days and greater than 35 days there is a higher likelihood that you may not be ovulating.