Track your menstrual cycle, predict your next period, ovulation dates, and fertile window with our easy-to-use period calculator.
Typical range: 21-35 days
Typical range: 3-7 days
Our period calculator is a comprehensive tool designed to help women track their menstrual cycle and predict important dates for reproductive health. By entering your last period date and cycle information, you can predict your next period, ovulation date, and fertile window.
This calculator uses standard calculations based on average cycle lengths and is designed for educational purposes. The menstrual cycle typically ranges from 21-35 days, with the average being 28 days. Ovulation usually occurs around day 14 of a 28-day cycle.
Disclaimer: This calculator provides estimates based on average cycles. Individual cycles can vary. For medical advice or concerns about your menstrual cycle, please consult with a healthcare professional.
Select the first day of your last menstrual period. This is the starting point for all calculations.
Enter your average cycle length (21-40 days). If unsure, 28 days is the typical average.
Input how many days your period typically lasts (3-10 days). The average is 5 days.
Get predictions for your next period, ovulation date, fertile window, and view the calendar visualization.
The period phase when the uterine lining sheds. Typically lasts 3-7 days.
When an egg is released from the ovary. Usually occurs around day 14 of a 28-day cycle.
The days when pregnancy is most likely. Includes 5 days before ovulation and ovulation day.