Period Calculator / Menstrual Cycle Tracker
Estimate your next period start dates, ovulation day, and fertile window based on your average cycle. This is a rough estimate and cycles can vary.
Disclaimer
Disclaimer: This tool is for informational purposes only and does not constitute medical advice.
Period and ovulation calculator notes
Estimate upcoming periods, ovulation days, and fertile windows using your average cycle length.
This page targets queries like “next period date calculator” and “ovulation window calculator”.
- Enter the first day of your last period and your average cycle length.
- Outputs next period, ovulation estimate, and fertile window dates.
- For pregnancy planning entertainment, visit the Chinese Gender Predictor (folklore-based).
Is this medical advice?
No—use it for planning, but always consult your healthcare provider for personal medical guidance.
Does cycle length matter?
Yes—enter your typical cycle length to get a better estimate for ovulation and fertile days.