ovulation calculator

Making your journey to parenthood simple and effective. Our free ovulation calculator helps you identify your most fertile days by tracking when your ovary releases an egg during your 28-day menstrual cycle.

Understanding your fertile window gives you confidence and clarity for your family-planning journey. Whether you’re using our ovulation calculator for conception or tracking your cycle for health monitoring, our tool provides accurate predictions to help you plan effectively.

Track your ovulation and take control of your fertility journey today.

Ready to track your fertility?

Use the calculator on the right to get started →

Track Your Ovulation

Select last period start date from wheel

Average Cycle Length (IN DAYS)

YOUR FERTILITY WINDOW

Based on your input, your estimated fertile window is:

Your estimated ovulation date is: .

The time around ovulation is the most fertile time in your cycle. For best results, use a combination of methods like basal body temperature (BBT) and ovulation predictor kits (OPKs).

How to Use the Ovulation Calculator

Step 1

Select Your Last Period Start Date

Use the circular calendar to select the first day of your last period. Move between months with the left and right arrows until you reach the correct date.

Step 2

Enter Your Cycle Length & Calculate

Enter your average cycle length in days in the box provided, then click Calculate Fertile Days to view your results. Most cycles range from about 20 to 45 days.

Step 3

View Your Results or download pdf

The calculator will show your estimated ovulation date and fertile window under Your Fertility Window. You can also download a PDF copy of the full results.

WHY USE OUR OVULATION CALCULATOR?

100% Free – No registration required

Accurate Results – Based on medical research

Downloadable PDF – Save and track your cycle

Privacy First – Your data stays with you

Easy to Use – Get results in 3 simple steps

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