Period Calculator
Predict your next period and fertile window.
Cycle Insight
Understanding your unique rhythm helps you take better control of your reproductive health.
How Period Prediction Works?
A period calculator estimates your next menstrual cycle and fertile window based on your average cycle length and the first day of your last period. Monitoring these dates helps you track your health, plan for the future, and understand your body's unique rhythm.
Understanding Your Cycle
Menstrual cycle tracking uses the first day of your last period (LMP) and your average cycle length to forecast future milestones. While every body is unique, these calculations provide a reliable baseline for physiological tracking and health awareness.
Health Awareness
Tracking your cycle is not just about pregnancy; it's a vital sign of your overall hormonal health and well-being.
The Prediction Logic
Next Period = Last Period Date + Cycle LengthOvulation typically occurs 14 days before the next period starts. The fertile window is estimated as 5 days leading up to and 1 day following ovulation, accounting for sperm longevity and egg viability.
Cycle Scenarios
Standard 28-Day Cycle
If your last period started on March 1, your next period is predicted for March 29, with ovulation around March 15.
Longer 35-Day Cycle
If your last period started on March 1, your next period is predicted for April 5, with ovulation around March 22.