ISIS Regional Fertility Centre

2180 Meadowvale Blvd.
Mississauga
Ontario L5N 5S3
Tel: 905-816-9822
Fax: 905-816-9833

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Ovulation Calculator

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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.

The 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:


high fertility Begin significant fertility	ovulation End significant fertility

CAUTION:This calendar cannot and 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.