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📅 Period Calculator
Predict your next period date, ovulation day, and fertile window based on your cycle length.
How Period Prediction Works
This calculator predicts your next period by adding your average cycle length to the first day of your last period. Ovulation is estimated at 14 days before the next period, and the fertile window spans 5 days before ovulation through 1 day after.
Understanding Your Cycle
The average menstrual cycle is 28 days, but normal cycles can range from 21 to 35 days. Tracking your cycle over several months helps improve prediction accuracy.
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