Introduction
By visiting and using the Period Calculator website ("Website") and its associated calculation tools, you acknowledge that you have read, understood, and agreed to this Disclaimer. If you do not agree with any part of this document, please stop using our tool and leave the Website.
Our Website offers an interactive period calculator designed to estimate menstrual cycle phases, fertile windows, and ovulation timing based on general clinical models. This tool is provided solely for convenience, educational tracking, and personal organization.
1. Medical Disclaimer
The information and tools on this Website do not constitute medical advice.
This Website and its calculators do not provide diagnosis, treatment, or medical advice. The content and calculations are for informational purposes only. They are not intended as a substitute for professional medical advice, diagnosis, or treatment.
Always consult with your physician, gynecologist, or other qualified healthcare professional regarding any medical questions, symptoms, or conditions. Do not ignore professional medical advice or delay seeking it because of information or calculation results you read on this Website.
No Doctor-Patient Relationship: Your use of this Website and its tools does not create a doctor-patient relationship between you and the operators of this Website. Any communications with us via email, contact forms, or other methods are not confidential medical consults.
Not for Contraceptive Planning: You must not rely on the calculations of this tool to prevent pregnancy. Cycle timing can vary due to physical stress, travel, sleep changes, illness, or hormonal fluctuations, making calendar tracking unreliable as a primary birth control method. Relying on this tool to prevent pregnancy carries a high risk of unintended pregnancy.
2. Accuracy Disclaimer
We try to ensure our calculations are based on established clinical tracking methods. However, we cannot guarantee that the predictions will be accurate or error-free.
The menstrual cycle is a dynamic biological process that varies from person to person and month to month. Factors that can affect cycle length and ovulation timing include:
- Hormonal changes, including thyroid conditions or Polycystic Ovary Syndrome (PCOS).
- Emotional stress, physical exhaustion, or changes in sleep patterns.
- Dramatically changes in diet, weight, or exercise routines.
- Illness, infections, or medical treatments.
- Hormonal contraceptives, emergency contraception, or other medications.
Because of these variables, our calculator's results are estimates. They represent typical averages and may not match your actual cycle timing. You use these calculations at your own risk.
3. Limitation of Liability
To the fullest extent permitted by law, the operators, authors, and contributors of this Website will not be liable for any direct, indirect, incidental, consequential, special, or exemplary damages arising from your use of or reliance on this Website and its tools.
This limitation of liability applies to damages for:
- Unintended pregnancy or complications related to fertility planning.
- Decisions made regarding athletic activities, travel plans, or personal events.
- Errors, omissions, or delays in predictions.
- Loss of data, browser crashes, or local storage malfunctions.
- Direct or indirect reliance on articles, guides, or FAQ answers on this Website.
We provide the Website and its tools on an "as is" and "as available" basis, without warranties of any kind, either express or implied, including warranties of merchantability, fitness for a particular purpose, or non-infringement.
4. Educational Purpose
All articles, explanations, and guides on this Website are written to support general reproductive health education. They describe typical menstrual cycles and reproductive biology.
This content is not medical guidelines. Reproductive health science is constantly evolving, and while we try to keep our information accurate and up-to-date, we do not warrant that all content is free from typographical errors, scientific changes, or omissions. You should verify medical facts with certified medical textbooks and your healthcare provider.
5. External Links Disclaimer
Our Website may contain links to external web pages, health blogs, research articles, or databases operated by third parties. These links are provided for reference and convenience only.
We do not control, endorse, or verify the content of these third-party websites. We are not responsible for their availability, accuracy, or privacy policies. If you decide to visit external websites, you do so under their terms of use and privacy policies.
6. User Consent
By using our Website and its calculator, you consent to this Disclaimer and agree to its terms. If you do not consent to these terms, you must stop using our Website immediately.
We reserve the right to modify, update, or change this Disclaimer at any time without notice. Changes will be posted on this page, and your continued use of the Website after updates are posted constitutes your agreement to the updated terms.
Last updated: July 3, 2026