Period Calculator
Track your menstrual cycle, predict your next period date, and understand your fertile window easily.
Enter Cycle Details
How to Use the Period Calculator
- Enter the first day of your last period.
- Enter your average cycle length (typically 21–35 days).
- The calculator predicts your next period and ovulation window.
Understanding Your Results
- Next Period Date: Expected start of your next cycle
- Ovulation Day: Most fertile day of your cycle
- Fertile Window: Best days to conceive
Frequently Asked Questions
Is this period calculator accurate?
This calculator provides estimates based on standard cycle patterns. Individual cycles may vary.
Can I use this if my periods are irregular?
For irregular cycles, predictions may be less accurate. Consult a gynecologist for guidance.
Is my data saved?
No. All calculations happen in your browser and no data is stored.
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⚠ Medical Disclaimer: This tool is for informational purposes only and does not replace professional medical advice. Always consult a qualified doctor for personalized guidance.