The short version: calculaterun.com's calculators and articles are free educational tools, not professional advice. Use them, but use your own judgment too.
1. Acceptance of These Terms
By accessing or using calculaterun.com (the "Site"), you agree to these Terms of Use. If you do not agree, please do not use the Site. References to "we," "us," or "our" refer to the operator of calculaterun.com.
2. What This Site Provides
calculaterun.com offers free, browser-based running calculators (pace, race prediction, training zones, heart rate, fueling, and course-condition tools) and related articles. All calculators run locally in your browser — no account, signup, or payment is required to use them.
3. Not Medical, Coaching, or Nutritional Advice
Nothing on this Site constitutes medical, coaching, or nutritional advice. Calculator outputs — race predictions, training paces, heart rate zones, fueling and hydration targets, calorie estimates, and all other results — are estimates based on published formulas and general models. They do not account for your individual health history, medical conditions, or circumstances.
Consult a physician before beginning any new training program, particularly if you have a pre-existing health condition, and consult a qualified coach or registered dietitian for individualized training or nutrition guidance. Running and endurance training carry inherent physical risk; you assume that risk when you use the guidance on this Site.
4. Accuracy of Calculators and Content
We aim for accuracy and test calculators against known reference values, but every output is a model-based estimate, not a guarantee. Formulas such as the Riegel race-time model, VDOT training paces, and heat/altitude adjustments are drawn from published research and coaching literature; they generalize across many runners and may not precisely predict your individual performance. We make no warranty, express or implied, as to the accuracy, completeness, reliability, or fitness for a particular purpose of any calculation, article, or other content on this Site.
5. Acceptable Use
You agree not to: (a) use the Site for any unlawful purpose; (b) attempt to interfere with, disrupt, or gain unauthorized access to the Site or its underlying code; (c) scrape, republish, or redistribute the Site's calculators or articles at scale without permission; or (d) use automated systems to place excessive load on the Site.
6. Intellectual Property
The text, articles, calculator design, and original content on this Site are the property of calculaterun.com unless otherwise noted. You may link to this Site freely and may reference or quote brief excerpts with attribution. Reproducing substantial portions of our articles or copying our calculators elsewhere without permission is not permitted.
7. Advertising
This Site displays advertising through Google AdSense. See our Privacy Policy for details on how advertising cookies are used and how to manage your preferences.
8. Affiliate Disclosure
calculaterun.com is a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for sites to earn advertising fees by linking to Amazon.com. Some links on this Site are affiliate links; if you click through and make a qualifying purchase, we may earn a commission at no additional cost to you. Product recommendations reflect our own editorial judgment and are not paid placements unless explicitly noted.
9. Third-Party Links
This Site may link to external websites, including Amazon, YouTube, and other resources. We do not control and are not responsible for the content, accuracy, or privacy practices of third-party sites. Visiting a linked site is at your own risk.
10. Disclaimer of Warranties
The Site is provided "as is" and "as available," without warranties of any kind, whether express or implied, including but not limited to warranties of merchantability, fitness for a particular purpose, and non-infringement. We do not warrant that the Site will be uninterrupted, error-free, or free of harmful components.
11. Limitation of Liability
To the fullest extent permitted by law, calculaterun.com and its operator are not liable for any injury, loss, damage, or expense — direct, indirect, incidental, or consequential — arising from your use of, or inability to use, this Site's calculators, training guidance, or articles. This includes, without limitation, injuries sustained while training or racing using paces, zones, or fueling targets generated by this Site.
12. Indemnification
You agree to indemnify and hold harmless calculaterun.com and its operator from any claims, damages, or expenses arising from your use of the Site or violation of these Terms.
13. Changes to the Site and These Terms
We may modify, suspend, or discontinue any part of the Site at any time. We may also update these Terms of Use periodically; changes will be reflected by an updated date at the top of this page. Continued use of the Site after changes constitutes acceptance of the revised Terms.
14. Governing Law
These Terms are governed by the laws of the United States and the state in which the Site operator resides, without regard to conflict-of-law principles, except where local consumer-protection law provides otherwise.
15. Contact
Questions about these Terms of Use? You can reach us at: info@calculaterun.com