Interactive Tool: When Are You Most Fertile
What does this tool measure?
Click here to find out when you are most likely to get pregnant.
This interactive tool estimates your peak fertility period, also known as your "fertile window." This is when you are most likely to get pregnant. Do not use this tool to prevent pregnancy.
To find your peak fertility period, the tool first calculates the day you are most likely to ovulate. This is the day an ovary releases an egg. In the tool, you will enter the typical length of your menstrual cycle, and you will click on the first day of your last menstrual period.
This calculator is meant to give you a rough estimate. Women usually ovulate at day 15, but it's also normal to ovulate well before or after the 15-day mark.
For information about reading your body's signs to tell when you will ovulate, see Fertility Awareness.
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