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Ovulation Predictor Calculator

Here is a free ovulation predictor / due date calculator. The calculator will show you your most fertile dates based on your period length and last period date.

Please select the first day of your last menstrual period:

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Usual number of days in your period:

Don't forget that date-based ovulation prediction isn't perfect. If you want more precise methods you may need to use some kits, measure your basal body temperature and so on.