Terms of Service

Acceptance of Terms

By accessing and using Target Heart Rate Calculator ("the website," "the service"), you agree to be bound by these Terms of Service. If you do not agree to these terms, please do not use the website. Your continued use of the website following any changes to these terms constitutes acceptance of those changes.

Description of Service

Target Heart Rate Calculator provides free online calculator tools for estimating maximum heart rate and calculating heart rate training zones. The service includes:

  • Maximum heart rate calculators using multiple formulas (Tanaka, Gulati, HUNT, and 220-age)
  • Target heart rate zone calculators for different fitness goals
  • Training zone calculators showing all five heart rate zones
  • Karvonen method calculators using Heart Rate Reserve
  • Educational content about heart rate-based training

The service is provided free of charge, requires no account or registration, and is accessible via any modern web browser. All calculations are performed locally in your browser using JavaScript.

Disclaimer of Warranties

The calculations provided by this website are estimates for informational and educational purposes only.

This website and its content are provided "as is" and "as available" without warranties of any kind, either express or implied, including but not limited to:

  • Warranties of merchantability or fitness for a particular purpose
  • Warranties that the service will be uninterrupted, error-free, or secure
  • Warranties regarding the accuracy, reliability, or completeness of results

This is not medical advice. The information and calculations provided should not be used as a substitute for professional medical advice, diagnosis, or treatment. Always consult with a qualified healthcare provider before beginning any exercise program, especially if you have cardiovascular disease, high blood pressure, diabetes, or other health conditions.

Heart rate formulas are based on population averages and may not accurately reflect your individual physiology. Your actual maximum heart rate may differ significantly from calculated estimates.

Limitation of Liability

To the fullest extent permitted by applicable law, Target Heart Rate Calculator and its operators shall not be liable for any direct, indirect, incidental, special, consequential, or punitive damages arising out of or relating to your use of, or inability to use, the website or its content.

This includes, but is not limited to:

  • Any decisions or actions you take based on calculator results
  • Any health outcomes or injuries related to exercise undertaken based on information from this website
  • Any errors or inaccuracies in calculations or content
  • Any interruption or cessation of the service

You use this calculator and its results entirely at your own risk.

Accuracy

We strive to provide accurate calculations based on established formulas from exercise physiology research. The formulas we use (Tanaka, Gulati, HUNT, Karvonen) are well-documented in scientific literature and widely used by fitness professionals.

However, we do not guarantee the accuracy of results for any individual user. Factors that can affect accuracy include:

  • Individual genetic variation in maximum heart rate
  • Fitness level and training history
  • Medications that affect heart rate
  • Health conditions
  • Age-related changes that may differ from population averages

The formulas and reference data used in our calculations are documented on the About page. The mathematical formulas themselves are part of the public domain of scientific knowledge.

Permitted Use

You may:

  • Use the calculator for personal, non-commercial purposes
  • Link to our website from your own website, blog, or social media
  • Share our URL with others
  • Reference our content with proper attribution

You may not:

  • Scrape, crawl, or use automated tools to access the website in a manner that places excessive load on our servers
  • Embed or iframe our calculator on another website without prior written permission
  • Copy substantial portions of our content, code, or design for use elsewhere
  • Use the website for any unlawful purpose
  • Attempt to interfere with or disrupt the website's operation
  • Remove or alter any copyright, trademark, or other proprietary notices

If you would like to embed our calculator or use our content in ways not covered above, please contact us to discuss permission.

Intellectual Property

The website design, layout, graphics, original content, and code are protected by copyright and other intellectual property rights. These materials may not be copied, reproduced, or distributed without permission.

The mathematical formulas used for heart rate calculations (220-age, Tanaka formula, Gulati formula, HUNT formula, Karvonen method) are part of the public domain of scientific knowledge and are not claimed as proprietary.

External Links

Our website may contain links to external websites or resources. These links are provided for convenience and informational purposes. We are not responsible for the content, accuracy, or availability of any external sites. Inclusion of a link does not imply endorsement of the linked site or its content.

Modifications to Service and Terms

We reserve the right to modify, suspend, or discontinue any aspect of the website at any time without notice. We also reserve the right to update these Terms of Service at any time.

When we make changes to these terms, we will update the "Last Updated" date at the bottom of this page. Your continued use of the website after any such changes constitutes your acceptance of the new terms. We encourage you to review these terms periodically.

Termination

We reserve the right to restrict or terminate access to the website for any user who violates these Terms of Service or engages in conduct that we determine to be harmful to the website, other users, or third parties.

Severability

If any provision of these Terms of Service is found to be unenforceable or invalid by a court of competent jurisdiction, that provision shall be limited or eliminated to the minimum extent necessary, and the remaining provisions shall continue in full force and effect.

Contact

If you have questions about these Terms of Service, please contact us:

Email: info@targetheartratecalculator.org

You can also reach us through our contact form.

Last Updated: January 2026