Last updated: October 17, 2026
Welcome to 1RM Calculator. By using this website, you agree to these Terms of Use. If you do not agree, please do not use the site.
Not medical advice
Important: The content and calculations on this website are for general information and educational purposes only. They are not medical, health, fitness or professional advice, and they are not a substitute for advice from a doctor, physiotherapist or qualified coach.
Always talk to a qualified healthcare professional before starting a new exercise program, especially if you have an injury, a medical condition, or are pregnant. Stop exercising immediately and seek help if you feel pain, dizziness or shortness of breath.
Estimates only
One rep max values, strength levels and training percentages shown on this site are estimates based on published formulas and general standards. Your real abilities may be higher or lower. We make no guarantee that any result is accurate, complete or suitable for your situation.
Your responsibility
Weight training carries a risk of injury. You use this website and act on its information at your own risk. You are responsible for lifting safely, using proper form, warming up, and using spotters or safety equipment where appropriate.
Acceptable use
You agree not to misuse the website, including by trying to disrupt it, gain unauthorized access to it, or copy it for commercial purposes without permission.
Intellectual property
The design, text and code of this website belong to 1RM Calculator unless stated otherwise. The 1RM formulas themselves are publicly published and credited to their original authors.
Limitation of liability
The website is provided "as is" and "as available", without warranties of any kind. To the fullest extent allowed by law, 1RM Calculator is not liable for any injury, loss or damage that results from using, or being unable to use, this website or its information.
Links to other websites
This site may link to other websites. We are not responsible for their content or privacy practices.
Changes to these terms
We may update these Terms of Use from time to time. Changes will be posted on this page with a new "Last updated" date. Continuing to use the site means you accept the updated terms.
Contact
Questions about these terms? Email us at bilal8011727@gmail.com. See also our Privacy Policy.