Ovulation Calculator

Calculate your estimated ovulation day and fertile window based on your last period date and average cycle length.

Source / method note

This calculation finds the estimated ovulation day by subtracting the luteal phase assumption from the average cycle length. The default luteal phase is 14 days and can be changed by the user.

Legal / official rate note

This tool is not medical advice or a birth control method. You should consult a healthcare professional for reproductive health and pregnancy planning.

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