Last updated 14 November 2026.
By using FinsAndFigures you agree to these terms.
The service
FinsAndFigures provides free calculators and guides for aquarium hobbyists. You may use them for personal or commercial purposes, link to them, and embed the calculators on your own site using the embed code we provide, leaving the credit link in place.
General information, not professional advice
The results and guides are general information. We work hard to make them accurate, but they depend on what you enter and on assumptions stated on each page.
- They are not veterinary advice. For sick or injured animals, consult an aquatic veterinarian.
- The glass-thickness and weight calculators are not structural engineering advice. Before building a large tank or placing a heavy one on a suspended floor, consult a qualified professional.
- Always follow the manufacturer's instructions for equipment, water treatments and medication.
No warranty
The site is provided "as is", without warranties of any kind. To the fullest extent the law allows, FinsAndFigures is not liable for loss or damage arising from use of the site, including loss of livestock, damage to property, or injury. Nothing in these terms limits liability that cannot be limited by law.
Our content
The text, design, code and species data on this site belong to FinsAndFigures. You may quote short passages with a link to the source. Please do not copy pages or the database wholesale.
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Changes
We may update the site and these terms. The date at the top shows the latest version.