Female Physiological Cycle Calculator

Professional prediction of the phases of your menstrual cycle， Including safe period, risk period (ovulation) and menstrual period. This tool is developed based on clinical medical models and is suitable for female users who need to prevent or prepare for pregnancy.

Core Functions

• Safe period / Dangerous period calculation： Input menstrual data to automatically calculate the ovulation date and high/low pregnancy risk period.
• Menstrual Cycle Record： Visualize recent cycle patterns and support abnormal flagging.
• Multi-scenario application： Assisting natural contraception, pregnancy planning or simple physiological monitoring.

How to use

1. Input baseline data： Date of last menstrual period, average cycle days (25-35 days), duration of menstrual period (3-7 days).
2. Get analysis report： Instantly generate a cycle forecast calendar for the next 6 months
3. View Detailed Instructions： Chart labeled with susceptible periods (red), relatively safe periods (green) and menstrual periods (blue)

Notes

⚠️ The tool uses a standard calculation model (calendar method), which is accurate to about 76-88% of the time. The accuracy is about 76-88%.。 The following conditions may affect the results: - Irregular cycles (fluctuations > 7 days) - Postpartum / breastfeeding - Recent use of emergency contraceptive pills - Endocrine diseases such as polycystic ovary syndrome It is recommended to use with thermometry, ovulation test strips or condoms.。 Consult your gynecologist if you have chronic cycle disorders. Data is only stored in your local browser, not uploaded to a server. Not uploaded to server， To ensure privacy and security.