Terms of use

What gillcalc is. gillcalc provides free, browser-based aquarium calculators and reference content. Results are estimates built from community-sourced rules and are shown with a confidence grade. They are not veterinary, engineering or professional advice.

No warranty. The calculators are provided “as is”. We work to keep the rules and numbers correct and dated, but we do not warrant that any result fits your animals, equipment or situation. You remain responsible for decisions about live animals.

Acceptable use. You may use the pages and print results for personal use. Do not scrape at a rate that degrades the service, resell the content as your own, or misrepresent the results as certified advice.

Intellectual property. Page text, code and the compiled rule summaries belong to gillcalc. Community rules are attributed to their sources; the compiled structure and wording are ours.

External links. Links to forums, manufacturers and other sites are provided for context. We do not control them and are not responsible for their content.

Changes. We may update the site and these terms. The date below shows the current version. Questions: support@gillcalc.com.

Last updated: October 18, 2026.