Ovulation Calculator

This free **ovulation calculator** helps you estimate your **fertile days** and ovulation date based on the first day of your last menstrual period (LMP) and your average cycle length. Tracking ovulation is useful when trying to conceive or avoid pregnancy naturally.

First Day of Last Menstrual Period (LMP) Average Cycle Length (days)

How This Calculator Works

The **fertility calculator** assumes that ovulation usually occurs about 14 days before your next period. For a 28-day cycle, ovulation occurs around day 14, with fertile days ranging from day 11 to day 16.

Example:

If your LMP was January 1 and your cycle length is 28 days:

• Ovulation Date → January 14
• Fertile Window → January 11 to January 16

Note: This is only an estimate. Hormonal changes, stress, or irregular cycles can affect ovulation. For best accuracy, use ovulation test kits or consult a doctor.