ovulation calculator

The Ovulation Calculator helps calculate when you are most likely to be fertile. By tracking your period month to month, you can provide greater accuracy to when you are ovulating.

Enter the first day of your last period and how long your cycle usually lasts (between 20 and 45 days). This calculator will show you the best days to have sex that could lead to pregnancy – so you can mark your calendar. Ovulation lasts for 12 to 48 hours, but you are potentially fertile for up to seven days. This is because sperm can survive up to 5 days in the female reproductive track.

Already pregnant? Visit the Pregnancy Calculator.

Like this Ovulation Calculator? Check out more of my calculators here!


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Angelique Johnson
Angelique Johnson
Owner at Nutrition by Angelique
Angelique Johnson, BS, NDTR is a Miami-based nutritionist who is excited to help others live healthier lives through good nutrition. She loves fitness, writing, blogging, cooking, and eating delicious foods.

A self-proclaimed chocolate-fanatic, she prides herself in being able to show others that there are no "bad foods," only "bad habits."

She received her Bachelors of Science in Nutrition and Dietetics and is currently a Master of Science in Nutrition and Dietetics candidate. Her plans include starting her PhD in the summer of 2016. She currently lives in Miami with her husband and French bulldog, Mingus.

Ovulation Calculator