Free aquarium fish stocking calculator: US gallons, fish count, adult inches per fish, bioload factor, 0.5/0.75/1.0 in/gal planning ceilings, headroom chart, and scenario rows for freshwater hobby planning—not veterinary advice.
Important: This aquarium fish stocking calculator is an educational planning aid only. Fish welfare depends on species behavior, filtration, oxygenation, swimming space, social grouping, and expert husbandry—never a single inches-per-gallon shortcut alone.
Summary: Enter tank volume, fish count, average adult body length (inches), and a feeding/bioload factor. The tool compares your effective fish inches to three common planning tiers (0.5, 0.75, and 1.0 in per US gallon) and charts headroom for discussion with experienced aquarists or retailers.
Aquarium fish stocking calculator (freshwater planning tiers)
Use this before buying livestock: align tank volume, realistic adult sizes, and conservative assumptions—then validate with species-specific guidance.
