About Our Mission and Team

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Our Mission: Private, Honest & Accessible Menstrual Calculations

Period Calculator (this website) was built with a clear purpose: to give girls, women, and families free, instant, and clinically accurate reproductive health calculators without compromising their privacy.

In an era where personal reproductive data is frequently harvested, stored in cloud databases, and monetized for advertising, we took an uncompromising stand: your menstrual cycle is your private health data.

Our Three Core Principles

  1. 100% Client-Side Privacy: Every calculation on this website runs exclusively inside your web browser using pure arithmetic. When you select a date or adjust cycle parameters, that information never leaves your device. We do not store cookies, we do not require account logins, and we have no backend databases storing your personal cycle dates.
  2. Clinical Accuracy & Evidence-Based Algorithms: Every formula on our site—from our Naegele due date calculations to our Ogino-Knaus fertile window ranges—is derived directly from peer-reviewed research and guidelines established by authoritative bodies, including the American College of Obstetricians and Gynecologists (ACOG), the National Health Service (NHS), the Centers for Disease Control and Prevention (CDC), and the Institute of Medicine (IOM).
  3. No Dark Patterns or Exaggerated Claims: We will never claim our tools “learn your body,” “diagnose conditions,” or replace the individualized care of a physician. We provide clear mathematical estimates, highlight biological uncertainties honestly, and guide users on when to seek professional medical evaluation.

Who We Are

This website is maintained and published by an independent team of web engineers, health content editors, and digital accessibility advocates dedicated to delivering fast, private, client-side tools.

How to Contact Us

Have feedback, questions about our calculations, or suggestions for new tools?

  • Email: infosemakanstr@gmail.com
  • Explore our full methodology on our How We Calculate page.