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The Menstrual Cycle Calculator
The Menstrual Cycle Calculator
With the Free Online Menstrual Cycle Calculator, you can calculate your average cycle length and predict your next period based on past cycle data.
The Menstrual Cycle Calculator helps you analyze the length and regularity of your menstrual cycles by entering the start dates of previous periods. Based on this data, the tool calculates your average cycle length and predicts when your next period is likely to begin. It also shows how much your cycles vary from month to month, providing valuable insights into your cycle regularity. Significant variations may indicate underlying health factors that should be discussed with a healthcare provider. This tool is intended for informational purposes and is not a substitute for medical advice.
Instructions
Number of Cycles: Select how many past menstrual cycles (2–12) you want to include in your calculation.
Cycle Start Dates: Enter the first day of each period as accurately as possible.
Calculate: Click the "Calculate Average" button to determine your average cycle length.
Results:
Average Cycle Length: The average length of your menstrual cycle.
Cycle Details: A breakdown of each interval between your recorded periods.
Cycle Regularity: Shows how much your cycle lengths vary. If your cycles differ by more than 5 days, calculations such as the predicted start of your next period or estimated ovulation day may not be very precise.
Next Period Prediction: An estimated start date for your next menstrual period.
Note: This tool is for educational use only and should not be used for contraception or medical diagnosis. If your cycles are highly irregular or show significant changes, consider consulting a healthcare professional.
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