Ovulation Calculator


Tracking your cycle can help with fertility. To give you the best chance of getting pregnant, our ovulation calculator tells you when you’re most likely to be fertile. Enter the first day of your last period and how long your cycle usually lasts (between 20 and 45 days). We’ll show you the best days to have sex that could lead to pregnancy – so you can mark your calendar.


Ovulation is one part of the female menstrual cycle whereby a mature ovarian follicle (part of the ovary) discharges an egg (also known as an ovum, oocyte, or female gamete). It is during this process that the egg travels down the fallopian tube where it may be met by a sperm and become fertilized.

Ovulation is controlled by a part of the brain called the hypothalamus, which sends signals that instruct the anterior lobe and pituitary gland to secrete luteinizing hormone (LH) and follicle-stimulating hormone (FSH).

The process usually occurs between the 10th and 19th day into the menstrual cycle, and this is the time where humans are most fertile.

What is an ovulation calendar?
An ovulation calendar is designed to help a woman predict when she will be most fertile. Several web applets exist (i.e., ovulation-calendar.net) that assist this process by asking questions, such as, when the beginning of the last menstrual cycle (period) was and how long the menstrual cycle generally lasts.

Some calendars also request the length of the luteal phase (the day after ovulation to the end of the monthly cycle). It is generally useful for women to record or chart menstrual information so that it is available for entering into the calendar program.

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