Period & Menstrual Cycle Tracker Calculator

What is Period & Menstrual Cycle Tracker?

The Period & Menstrual Cycle Tracker forecasts the exact start dates, duration, and cycle phases for your next 6 upcoming periods based on your historical cycle length. It provides a visual breakdown of your follicular phase, ovulation window, and luteal phase with complete privacy and zero account registration.

Designed for accuracy, speed, and privacy, this tool runs entirely on your local device with zero network latency.

How to Use the Period & Menstrual Cycle Tracker

1. 1
   Enter the start date of your most recent period.
2. 2
   Specify your average menstrual cycle length (days between the start of one period and the start of the next).
3. 3
   Enter the typical duration of your menstrual bleeding (usually 3 to 7 days).
4. 4
   View the interactive multi-month calendar projection displaying upcoming period start dates, fertile windows, and cycle phase badges.

Formula & Calculation Logic

Projects forward chronological cycle start dates across multiple lunar calendar intervals, computing respective phase boundaries (Menstrual, Follicular, Ovulatory, and Luteal).