Menstrual Cycle Period Calculator
Predict your next period, ovulation, and fertile window based on your cycle length and last period start date.
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How to use this tool?
- 1 Enter the requested data in the fields above carefully.
- 2 Click the calculate button to process the information instantly.
- 3 Analyze the detailed result and the formula explanation presented below.
- 4 You can print, share, or even embed the calculator on your own site for free.
Unlike traditional static calculators, our tools adapt to specific user needs. They include detailed explanations of the formulas used, ensuring transparency in results. Furthermore, our design is focused on user experience, eliminating distractions and focusing on what really matters: your data and conclusions.
Previous Results
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Frequently Asked Questions
A menstrual cycle is the time from the first day of one period to the first day of the next period. The average cycle is 28 days, but it can range from 21 to 35 days.
Ovulation typically occurs 14 days before the next period starts. By subtracting the luteal phase length from the predicted next period date, we estimate the ovulation day.
The fertile window is the days when pregnancy is most likely. It includes the 5 days before ovulation and the day of ovulation itself, due to sperm lifespan.
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