Female Physiological Cycle Calculator

Expertly predicts the phases of your menstrual cycle， Including safe period, risk period (ovulation) and menstrual period. This tool is developed based on clinical models and is suitable for women who need to use contraception or prepare for pregnancy.

Core Functions

• Safe period / Dangerous period calculation： Input menstrual data to automatically calculate the date of ovulation and high/low risk periods for pregnancy.
• Menstrual Cycle Record： Visualisation of recent cycle patterns and support for 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 labelled 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 gynaecologist if you have chronic cycle disorders. The data is only stored in the local browser, it is not uploaded to the server. Not uploaded to server， To ensure privacy and security.