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Ovulation Calculator

Ovulation Calculator
Knowing the days you are most likely to be fertile or ovulate can increase your chance of getting pregnant. 28 days long menstrual cycle is common, but each woman is different. There are about 6 days during each menstrual cycle when you can get pregnant. This is called your fertile window or ovulation time. Use the calculator to see which days you are most likely to be fertile.

Calculate ovulation

First day of your last period

Length of your cycle

*** This ovulation calculator provides an estimate of your fertile window and is not a guarantee of pregnancy or of birth control. The calculator and information on this website are not medical advice. Talk to your doctor or nurse to plan for pregnancy and find the birth control that works for you. Fertile windows are different for every woman and can be different from month to month in the same woman.