Ovulation Calculator

Please select the first day of your last menstrual period:

/ /

Usual number of days in your cycle:

*Average length will vary by woman.
**A woman's best days to conceive can start at least one day prior and last at least one day after fertile date.

Our ovulation calculator helps you to predict your most fertile days of the month. Identifying the days of ovulation will help you find out when you are most likely to conceive. Menstrual cycles vary from woman to woman and month-to-month.

Use this calculator to help estimate the timing of your ovulation using the number of days in your cycle and the first date of your last menstrual period.

To narrow down the timing of your fertile window, track ovulation using a Natural Family Planning Method like Basal Body Temperature Tracking, Cervical Mucous Charting, and/or the Calendar Method. Don’t have a regular 28-day cycle? Most women experience irregular cycles and can track ovulation using one of these four tracking tools.

The Stork® OTC

The Stork OTC is a home conception aid to help people become pregnant using cervical cap insemination around the time of ovulation in the privacy of their home.

The Stork OTC Box

Two Products We Recommend

Ovulation Plus Pregnancy Test

Increase your chances of getting pregnant sooner by predicting your most important, fertile days. Learn More Coupons

First Response Ovulation Test

Fertility & Ovulation Tracking App

Available for free on iOS & Android. Download here:


Glow iPhone App