Fertility calculator

This calculator is a guide to help you track your ovulation day.

Most women have 28-32 day cycles and ovulation can take place during days 11-21 of the menstrual cycle. These days represent average cycles; many women have slightly shorter cycles and ovulate earlier and others have longer monthly cycles with ovulation occurring later in the month.

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.

The beginning of last menstrual period:

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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 that:

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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: (± 3 months ago)

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Your menstrual cycle is approximately: days long

Date of next menstrual cycle should be:

Fertility Results

BEGINS Significant Fertility
(High Fertility)

ENDS Significant Fertility
(Ovulation)

 

REMEMBER: These dates given here are estimates
CAUTION: This calendar cannot and should not be used to prevent pregnancy.