Menstrual Cycle Calculator

A menstrual cycle calculator is a free online tool that estimates your next period, ovulation date, and fertile window based on the first day of your last menstrual period (LMP) and your average cycle length. It helps you track your menstrual cycle and better understand your reproductive health.

Simply enter the first day of your last period and your average menstrual cycle length (such as 28 days). The calculator will estimate your next period, likely ovulation day, and your most fertile days.

The calculator provides an estimate based on the information you enter. It is most accurate for people with regular menstrual cycles. If your cycles are irregular, the predictions may vary and should not be used as a substitute for medical advice or contraception.

Yes. The calculator estimates your fertile window and the days when pregnancy is most likely. Many people use it for family planning, trying to conceive, or understanding their menstrual cycle patterns.

Yes, but the results may be less accurate if your menstrual cycles vary significantly in length. If you have consistently irregular periods, missed periods, or concerns about your menstrual health or fertility, it's best to consult a qualified healthcare professional for personalized guidance.