Menstrual Cycle Calculator
Predict the start date of your next period.
Your results will appear here
Enter your cycle details to see a forecast.
Understanding Your Menstrual Cycle
Tracking your menstrual cycle is a key part of understanding your health. This calculator provides a simple way to predict when your next period will arrive, helping you plan ahead and stay in tune with your body's natural rhythm.
How to Use the Menstrual Cycle Calculator
Enter Last Period
Select the date your last period started.
Enter Cycle Length
Input your average cycle length in days.
Get Your Forecast
Instantly see your next estimated period date.
Plan Ahead
View predictions for the next three cycles.
Common Use Cases for a Cycle Calculator
Get an estimate of when your next period will start to be prepared.
Anticipate your cycle to better track and understand PMS or other symptoms.
Learn more about your body's natural rhythm and typical cycle length.
Plan trips and important events with your menstrual cycle in mind.