What is an ovulation calculator? An ovulation calculator is a tool for predicting a woman\’s fertility cycle. The female reproductive cycle refers to the menstrual cycle and ovulation cycle. The normal menstrual cycle is about 28 days, and the ovulation period is added to this by 14 days. However, every woman\’s fertility cycle is different, so an ovulation calculator is needed to predict the best time to conceive. Where to predict your fertility cycle easily and quickly? Now, there are