# Free Ovulation Tracker & Fertility Calculator

> A science-backed, privacy-first reproductive health tool to calculate fertile windows, ovulation dates, and conception odds.

## Core Features
- Clinical Ovulation Calculation: Based on First Day of Last Menstrual Period (LMP) and customizable Luteal Phase Duration (10–18 days).
- 6-Day Fertile Window: The 5 days before ovulation plus ovulation day itself.
- Wilcox Conception Probabilities: Daily odds based on peer-reviewed New England Journal of Medicine research (O-2: 27%, O-1: 31%, O: 12%).
- Multi-Month Fertility Calendar: Interactive visual view with menstrual flow, fertile days, implantation window, and pregnancy test day.
- Future Cycle Forecasting: Projects the next 6 upcoming cycles with period dates and estimated due dates if conceived.
- Calendar Synchronization: One-click export to Google Calendar, Apple iCal, and Microsoft Outlook (.ics).
- Complete Privacy: 100% client-side JavaScript execution with zero remote database persistence.

## Key Routes
- Homepage & Calculator: https://freeovulationtracker.com/
- About Us: https://freeovulationtracker.com/about-us/
- Contact: https://freeovulationtracker.com/contact-us/
- Terms of Service: https://freeovulationtracker.com/terms/
- Privacy Policy: https://freeovulationtracker.com/privacy/
- Sitemap: https://freeovulationtracker.com/sitemap/
- Blog & Guides: https://freeovulationtracker.com/blog/