Menstrual Cycle Calculator

Track your cycle, estimate ovulation, and understand your fertile window.

First Day of Your Last Period:

Average Cycle Length (21–45 days):

Important Information

This calculator provides estimates based on average cycle patterns.
Results may not be accurate for irregular cycles.
Ovulation is estimated as occurring 14 days before the next expected period.
For pregnancy planning or medical concerns, consult a qualified healthcare professional.

Medical Disclaimer: This tool is for educational purposes only and does not replace professional medical advice, diagnosis, or treatment. Always seek guidance from a licensed healthcare provider regarding your reproductive health.