Fertility
Period & Ovulation Calculator
See your most fertile days, your estimated ovulation date and your upcoming periods, based on the first day of your last period and your usual cycle length.
100% private — calculated in your browser. Nothing is saved or sent.
From the first day of one period to the first day of the next.
Enter your last period date to see your fertile window.
This tool gives general estimates for educational purposes and is not a substitute for professional medical advice, diagnosis or treatment. Please consult Dr. Ayesha Jawed for care tailored to you.
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