About this calculator

Volume (L) = L × W × H (cm) ÷ 1000. The old 1 inch of fish per US gallon rule is a starting point — large or active species need more.

Frequently asked questions

What does the Aquarium Volume & Stocking Calculator do?

Aquarium volume and a rough stocking estimate by 'inch per gallon'. Volume (L) = L × W × H (cm) ÷ 1000. The old 1 inch of fish per US gallon rule is a starting point — large or active species need more.

Is the Aquarium Volume & Stocking Calculator free to use?

Yes. Every calculator on Calcurly.com is free, works in your browser without sign-up, and can be embedded on your own website.

How accurate is the Aquarium Volume & Stocking Calculator?

Results are calculated in real time using industry-standard formulas. Treat the output as a well-informed estimate — always cross-check with local regulations, product datasheets, or a qualified pet care professional before committing to a purchase or a job.

What inputs does the Aquarium Volume & Stocking Calculator need?

Enter values for: Length (cm), Width (cm), Height (cm). Sensible defaults are pre-filled where possible so you can start with a single change.

Can I embed the Aquarium Volume & Stocking Calculator on my own website?

Yes — copy the iframe snippet at the bottom of this page, or use the Embed Generator to customise the size. The embedded version stays in sync with the live calculator on Calcurly.com.