Terms of Use

The short version

reefcalcs is free for personal and commercial use. Embed the calculators on your blog, reference the parameter pages in your forum posts, screenshot the dashboard for your reef Discord — go ahead. Don't scrape the site to rebuild a competing calculator, don't republish the calculator output as a paid product, and don't blame us if a dose goes sideways.

Use of the site

By accessing reefcalcs you agree to use the site for its intended purpose — as a reference for reef and aquarium chemistry. You may:

• Use the calculators for any personal or commercial reef-keeping decision
• Embed any calculator via the published /embed/<name> iframe URL, on any site, for free
• Link to any page on the site without restriction
• Quote short excerpts of the parameter and guide content with attribution

You may not:

• Programmatically scrape the entire site for the purpose of reposting or rebuilding it elsewhere
• Strip the Powered by ReefCalcs attribution from an embedded calculator
• Misrepresent reefcalcs content as your own original research
• Use the site or its content to provide veterinary or medical advice for animals — see the disclaimer

Content licence

Original prose and calculator logic on reefcalcs is licensed for free editorial use with attribution. Quotations from primary sources (Randy Holmes-Farley, Bulk Reef Supply, Tropic Marin, Red Sea, Triton, peer-reviewed papers) are subject to their own copyrights and are reproduced under fair use for educational purposes. The CaribSea, Nature's Ocean, Instant Ocean, and other product names and densities cited on the site are the property of their respective trademark holders.

Embed widget terms

The /embed/<name> calculator iframes are provided as a free service. The host site must keep the Powered by ReefCalcs footer visible and clickable. We reserve the right to update the calculator implementation at any time; if a backwards-incompatible change is needed, the previous version will remain available at the same URL for at least 30 days.

No warranty

The site is provided as-is. We make no warranty of accuracy, completeness, or fitness for any specific reef-keeping purpose. Reef chemistry involves living animals; see the disclaimer for the full breakdown.

Limitation of liability

To the maximum extent permitted by law, the operators of reefcalcs are not liable for any damages — direct, indirect, incidental, or consequential — including but not limited to livestock loss, tank failure, equipment damage, or commercial loss, arising from the use of this site or its content.

Changes

These terms may change. The current version is the one you are reading, with the date stamped at the top. Continued use of the site after a change constitutes acceptance of the new terms.

Contact

Questions or licensing requests: hello@reefcalcs.com.