Ovulation and Fertility Window Estimator

The Ovulation and Fertility Window Estimator helps individuals identify the most fertile days within a menstrual cycle. By estimating ovulation timing, it supports family planning, whether trying to conceive or avoid pregnancy. The tool also improves menstrual cycle awareness and encourages informed reproductive health decisions.


The cycle lenght is the number of days between one period and another. It is ususally between 21 and 35 days.

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Medical disclaimer: This tool is for informational purposes only and does not replace professional medical advice.

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