Period & Ovulation Calculator
Predict your next period and estimated ovulation window based on your cycle length and last period date.
period calculator
menstrual cycle
ovulation
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Common Cycle Lengths
Typical menstrual cycle lengths for quick estimation
1Cycle Information
Enter your menstrual cycle details for prediction
How it works: Enter your last period start date, typical cycle length, and period length. The calculator estimates your next period, ovulation date, and fertile window based on average patterns.
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