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Ovulation Calculator
Estimate your ovulation date, fertile window, and next period based on your menstrual cycle.
Ovulation Details
Enter your last period date and average cycle length.
days
Typical cycle length is around 21–45 days.
How it is estimated
Ovulation is estimated to occur approximately 14 days before the next menstrual period.
Ovulation ≈ Next Period − 14 days
Your Ovulation Estimate
Estimated dates based on your cycle information.
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Your results will appear here
Enter your period information and calculate.
Important: This calculator provides an estimated ovulation date based on the information entered. It should not be used as a method of contraception or as a substitute for professional medical advice.