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Ovulation Calculator

pink calendar icon Charting Your Fertility

Use this calculator to predict the timing of your ovulation and most fertile days of the month. By determining when you are most fertile, you can increase your chances of getting pregnant.

To use the calculator, just enter the first day of your last period and the length of your menstrual cycle in days.

When was the first day of your last period?

What is the length of your menstrual cycle? (days)

Your next ovulation is…

You are most likely fertile between…

Menstrual cycle end date

If you conceive, your resulting due date will be…

Your Upcoming Fertility Dates



Note: This calculator provides approximate dates for women with a regular menstrual cycle only. If you have an irregular menstrual cycle, this calculator may not provide accurate fertility dates.

This calculator should not be used to prevent pregnancy.


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