Ovulation Calculator

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Predicts the likely days of ovulation based on the first day of your last menstrual period and the length of your typical menstrual cycle. This calculator provides an estimate and should not be used as a method of birth control.

Results

Estimated Ovulation Day

Estimated Fertile Window Start

Estimated Fertile Window End

Inputs

Presets:

First Day of Last Menstrual Period

Typical Cycle Length (days)

days