Calculators
Our calculators are great tools to help you estimate your menstrual cycle length, fertile window, and safe days for intimacy. Calculator tools are not a guarantee of pregnancy or prevention of pregnancy. Results are estimates and will vary for each woman.
Click the Calculator links below to get started.
Use the Menstrual Cycle Calculator to estimate the length of your cycle to prepare for upcoming cycles. Get the average length of three cycles.
Use the Fertile Window Calculator to see your target ovulation days and when you are most likely fertile.
Need Help With Our Calculators?
We’d love to help you estimate your menstrual length, fertile window, and safe days to plan or prevent pregnancy.